Abstract

The results of an intercalibration between the extreme ultraviolet spectrometers Coronal Diagnostic Spectrometer (CDS) and Solar Ultraviolet Measurements of Emitted Radiation (SUMER) onboard the Solar and Heliospheric Observatory (SOHO) are presented. During the joint observing program Intercal_01, CDS and SUMER were pointed at the same locations in quiet Sun areas and observed in the same wavelength bands located around the spectral lines He i 584 Å, Mg x 609 Å, and Mg x 624 Å. The data sets analyzed here consist of raster images recorded by the CDS normal-incidence spectrometer and SUMER detector A and span the time from March 1996 to August 1996. Effects of the different spatial and spectral resolutions of both instruments have been investigated and taken into account in the analysis. We find that CDS measures generally a 30% higher intensity than SUMER in the He i 584-Å line, while it measures 9% and 17% higher intensities in Mg x 609 Å and Mg x 624 Å, respectively. Both instruments show very good temporal correlation and stability, indicating that solar variations dominate over changes in instrumental sensitivity. Our analysis also provides in-flight estimates of the CDS spatial point-spread functions.

© 1999 Optical Society of America

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  1. B. Fleck, V. Domingo, A. Poland, eds., “The SOHO mission,” Sol. Phys. 162, Nos. 1–2 (1995).
  2. M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
    [CrossRef]
  3. E. M. Reeves, J. G. Timothy, M. C. E. Huber, G. L. Withbroe, “Photometric calibration of the EUV spectroheliometer on ATM,” Appl. Opt. 16, 849–857 (1977).
    [PubMed]
  4. P. Lemaire, “Sensitivity changes in the CNRS Ultraviolet Spectrometer aboard OSO-8,” ESA J. 15, 238–242 (1991).
  5. J. Hollandt, M. C. E. Huber, M. Kühne, “Hollow cathode transfer standards for the radiometric calibration of VUV telescopes of the Solar and Heliospheric Observatory (SOHO),” Metrologia 30, 381–388 (1993).
    [CrossRef]
  6. J. Hollandt, U. Schühle, W. Paustian, W. Curdt, M. Kühne, B. Wende, K. Wilhelm, “Radiometric calibration of the telescope and ultraviolet spectrometer SUMER on SOHO,” Appl. Opt. 35, 5125–5133 (1996).
    [CrossRef] [PubMed]
  7. J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).
  8. K. Wilhelm, P. Lemaire, U. Feldman, J. Hollandt, U. Schühle, W. Curdt, “Radiometric calibration of SUMER: Refinement of the laboratory results under operational conditions on SOHO,” Appl. Opt. 36, 6416–6422 (1997).
    [CrossRef]
  9. U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, “Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission,” Appl. Opt. 37, 2646–2652 (1998).
    [CrossRef]
  10. P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The EUV solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” submitted to Astrophys. J.
  11. K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
    [CrossRef]
  12. K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).
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    [CrossRef]
  15. R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
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  16. H. P. Summers, “Atomic data and analysis structure,” (Culham, UK, 1994); see also http://patiala.phys.strath.ac.uk/adas .
  17. J. Lang, H. E. Mason, R. W. P. McWhirter, “The interpretation of the spectral line intensities from the CHASE spectrometer on spacelab 2,” Sol. Phys. 129, 31–81 (1990).
    [CrossRef]
  18. M. Stix, The Sun (Springer-Verlag, Berlin, 1994), Chap. 3.

1998 (2)

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, “Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission,” Appl. Opt. 37, 2646–2652 (1998).
[CrossRef]

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

1997 (2)

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

K. Wilhelm, P. Lemaire, U. Feldman, J. Hollandt, U. Schühle, W. Curdt, “Radiometric calibration of SUMER: Refinement of the laboratory results under operational conditions on SOHO,” Appl. Opt. 36, 6416–6422 (1997).
[CrossRef]

1996 (1)

1995 (3)

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

B. Fleck, V. Domingo, A. Poland, eds., “The SOHO mission,” Sol. Phys. 162, Nos. 1–2 (1995).

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

1993 (1)

J. Hollandt, M. C. E. Huber, M. Kühne, “Hollow cathode transfer standards for the radiometric calibration of VUV telescopes of the Solar and Heliospheric Observatory (SOHO),” Metrologia 30, 381–388 (1993).
[CrossRef]

1991 (1)

P. Lemaire, “Sensitivity changes in the CNRS Ultraviolet Spectrometer aboard OSO-8,” ESA J. 15, 238–242 (1991).

1990 (1)

J. Lang, H. E. Mason, R. W. P. McWhirter, “The interpretation of the spectral line intensities from the CHASE spectrometer on spacelab 2,” Sol. Phys. 129, 31–81 (1990).
[CrossRef]

1977 (1)

1973 (1)

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
[CrossRef]

Al Janabi, K. F.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Aschenbach, B.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Bräuninger, H.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Breeveld, A. A.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

Breeveld, E. R.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

Brekke, P.

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, “Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission,” Appl. Opt. 37, 2646–2652 (1998).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The EUV solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” submitted to Astrophys. J.

Bromage, B. J. I.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

Carter, M. K.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Cruise, A. M.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Culhane, J. L.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Curdt, W.

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, “Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission,” Appl. Opt. 37, 2646–2652 (1998).
[CrossRef]

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

K. Wilhelm, P. Lemaire, U. Feldman, J. Hollandt, U. Schühle, W. Curdt, “Radiometric calibration of SUMER: Refinement of the laboratory results under operational conditions on SOHO,” Appl. Opt. 36, 6416–6422 (1997).
[CrossRef]

J. Hollandt, U. Schühle, W. Paustian, W. Curdt, M. Kühne, B. Wende, K. Wilhelm, “Radiometric calibration of the telescope and ultraviolet spectrometer SUMER on SOHO,” Appl. Opt. 35, 5125–5133 (1996).
[CrossRef] [PubMed]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Cutler, R. M.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Dammasch, I. E.

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

Dupree, A. K.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
[CrossRef]

Eparvier, F. G.

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The EUV solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” submitted to Astrophys. J.

Feldman, U.

Fludra, A.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Gabriel, A.

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Gabriel, A. H.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Goldberg, L.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
[CrossRef]

Grewing, M.

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Harrison, R. A.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Hassler, D. M.

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Haynes, R. W.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Hollandt, J.

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, “Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission,” Appl. Opt. 37, 2646–2652 (1998).
[CrossRef]

K. Wilhelm, P. Lemaire, U. Feldman, J. Hollandt, U. Schühle, W. Curdt, “Radiometric calibration of SUMER: Refinement of the laboratory results under operational conditions on SOHO,” Appl. Opt. 36, 6416–6422 (1997).
[CrossRef]

J. Hollandt, U. Schühle, W. Paustian, W. Curdt, M. Kühne, B. Wende, K. Wilhelm, “Radiometric calibration of the telescope and ultraviolet spectrometer SUMER on SOHO,” Appl. Opt. 35, 5125–5133 (1996).
[CrossRef] [PubMed]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Hollandt, M. C. E. Huber, M. Kühne, “Hollow cathode transfer standards for the radiometric calibration of VUV telescopes of the Solar and Heliospheric Observatory (SOHO),” Metrologia 30, 381–388 (1993).
[CrossRef]

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

Huber, M. C. E.

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

J. Hollandt, M. C. E. Huber, M. Kühne, “Hollow cathode transfer standards for the radiometric calibration of VUV telescopes of the Solar and Heliospheric Observatory (SOHO),” Metrologia 30, 381–388 (1993).
[CrossRef]

E. M. Reeves, J. G. Timothy, M. C. E. Huber, G. L. Withbroe, “Photometric calibration of the EUV spectroheliometer on ATM,” Appl. Opt. 16, 849–857 (1977).
[PubMed]

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
[CrossRef]

Jordan, S. D.

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Karud, J.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Kent, B. J.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

Kjeldseth-Moe, O.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Kucera, T.

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

Kühne, M.

J. Hollandt, U. Schühle, W. Paustian, W. Curdt, M. Kühne, B. Wende, K. Wilhelm, “Radiometric calibration of the telescope and ultraviolet spectrometer SUMER on SOHO,” Appl. Opt. 35, 5125–5133 (1996).
[CrossRef] [PubMed]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Hollandt, M. C. E. Huber, M. Kühne, “Hollow cathode transfer standards for the radiometric calibration of VUV telescopes of the Solar and Heliospheric Observatory (SOHO),” Metrologia 30, 381–388 (1993).
[CrossRef]

Lang, J.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Lang, H. E. Mason, R. W. P. McWhirter, “The interpretation of the spectral line intensities from the CHASE spectrometer on spacelab 2,” Sol. Phys. 129, 31–81 (1990).
[CrossRef]

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

Lemaire, P.

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, “Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission,” Appl. Opt. 37, 2646–2652 (1998).
[CrossRef]

K. Wilhelm, P. Lemaire, U. Feldman, J. Hollandt, U. Schühle, W. Curdt, “Radiometric calibration of SUMER: Refinement of the laboratory results under operational conditions on SOHO,” Appl. Opt. 36, 6416–6422 (1997).
[CrossRef]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

P. Lemaire, “Sensitivity changes in the CNRS Ultraviolet Spectrometer aboard OSO-8,” ESA J. 15, 238–242 (1991).

Maltby, P.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Marsch, E.

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Mason, H. E.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Lang, H. E. Mason, R. W. P. McWhirter, “The interpretation of the spectral line intensities from the CHASE spectrometer on spacelab 2,” Sol. Phys. 129, 31–81 (1990).
[CrossRef]

McCalden, A. J.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

McWhirter, R. W. P.

J. Lang, H. E. Mason, R. W. P. McWhirter, “The interpretation of the spectral line intensities from the CHASE spectrometer on spacelab 2,” Sol. Phys. 129, 31–81 (1990).
[CrossRef]

Norman, K.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Noyes, R. W.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
[CrossRef]

Parker, D. J.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Parkinson, J. H.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Parkinson, W. H.

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
[CrossRef]

Paustian, W.

Payne, J.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

Peskett, S. C.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Pike, C. D.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

Poland, A.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

Poland, A. I.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Reeves, E. M.

E. M. Reeves, J. G. Timothy, M. C. E. Huber, G. L. Withbroe, “Photometric calibration of the EUV spectroheliometer on ATM,” Appl. Opt. 16, 849–857 (1977).
[PubMed]

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
[CrossRef]

Richards, A. G.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Sawyer, E. C.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Schühle, U.

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, “Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission,” Appl. Opt. 37, 2646–2652 (1998).
[CrossRef]

K. Wilhelm, P. Lemaire, U. Feldman, J. Hollandt, U. Schühle, W. Curdt, “Radiometric calibration of SUMER: Refinement of the laboratory results under operational conditions on SOHO,” Appl. Opt. 36, 6416–6422 (1997).
[CrossRef]

J. Hollandt, U. Schühle, W. Paustian, W. Curdt, M. Kühne, B. Wende, K. Wilhelm, “Radiometric calibration of the telescope and ultraviolet spectrometer SUMER on SOHO,” Appl. Opt. 35, 5125–5133 (1996).
[CrossRef] [PubMed]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Self, D. G.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Siegmund, O. H. W.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Stix, M.

M. Stix, The Sun (Springer-Verlag, Berlin, 1994), Chap. 3.

Summers, H. P.

H. P. Summers, “Atomic data and analysis structure,” (Culham, UK, 1994); see also http://patiala.phys.strath.ac.uk/adas .

Thomas, P. D.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

Thomas, R. J.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Thompson, W. T.

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The EUV solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” submitted to Astrophys. J.

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

Timothy, J. G.

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

E. M. Reeves, J. G. Timothy, M. C. E. Huber, G. L. Withbroe, “Photometric calibration of the EUV spectroheliometer on ATM,” Appl. Opt. 16, 849–857 (1977).
[PubMed]

Vial, J.-C.

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Wende, B.

Wilhelm, K.

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

K. Wilhelm, P. Lemaire, U. Feldman, J. Hollandt, U. Schühle, W. Curdt, “Radiometric calibration of SUMER: Refinement of the laboratory results under operational conditions on SOHO,” Appl. Opt. 36, 6416–6422 (1997).
[CrossRef]

J. Hollandt, U. Schühle, W. Paustian, W. Curdt, M. Kühne, B. Wende, K. Wilhelm, “Radiometric calibration of the telescope and ultraviolet spectrometer SUMER on SOHO,” Appl. Opt. 35, 5125–5133 (1996).
[CrossRef] [PubMed]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Withbroe, G. L.

E. M. Reeves, J. G. Timothy, M. C. E. Huber, G. L. Withbroe, “Photometric calibration of the EUV spectroheliometer on ATM,” Appl. Opt. 16, 849–857 (1977).
[PubMed]

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
[CrossRef]

Woods, T. N.

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The EUV solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” submitted to Astrophys. J.

Appl. Opt. (4)

Astron. Astrophys. (1)

K. Wilhelm, P. Lemaire, I. E. Dammasch, J. Hollandt, U. Schühle, W. Curdt, T. Kucera, D. M. Hassler, M. C. E. Huber, “Solar irradiances and radiances of UV and EUV lines during the minimum of sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

Astrophys. J. (1)

M. C. E. Huber, A. K. Dupree, L. Goldberg, R. W. Noyes, W. H. Parkinson, E. M. Reeves, G. L. Withbroe, “The Harvard experiment on OSO-6: Instrumentation, calibration, operation and description of observations,” Astrophys. J. 183, 291–312 (1973).
[CrossRef]

ESA J. (1)

P. Lemaire, “Sensitivity changes in the CNRS Ultraviolet Spectrometer aboard OSO-8,” ESA J. 15, 238–242 (1991).

Metrologia (1)

J. Hollandt, M. C. E. Huber, M. Kühne, “Hollow cathode transfer standards for the radiometric calibration of VUV telescopes of the Solar and Heliospheric Observatory (SOHO),” Metrologia 30, 381–388 (1993).
[CrossRef]

Sol. Phys. (5)

B. Fleck, V. Domingo, A. Poland, eds., “The SOHO mission,” Sol. Phys. 162, Nos. 1–2 (1995).

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Haynes, B. J. Kent, J. Lang, D. J. Parker, J. Payne, C. D. Pike, S. C. Peskett, A. G. Richards, J. L. Culhane, K. Norman, A. A. Breeveld, E. R. Breeveld, K. F. Al Janabi, A. J. McCalden, J. H. Parkinson, D. G. Self, P. D. Thomas, A. I. Poland, R. J. Thomas, W. T. Thompson, O. Kjeldseth-Moe, P. Brekke, J. Karud, P. Maltby, B. Aschenbach, H. Bräuninger, M. Kühne, J. Hollandt, O. H. W. Siegmund, M. C. E. Huber, A. H. Gabriel, H. E. Mason, B. J. I. Bromage, “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” Sol. Phys. 162, 233–290 (1995).
[CrossRef]

R. A. Harrison, A. Fludra, C. D. Pike, J. Payne, W. T. Thompson, A. Poland, E. R. Breeveld, A. A. Breeveld, J. L. Culhane, O. Kjeldseth-Moe, M. C. E. Huber, B. Aschenbach, “High resolution observations of the extreme ultraviolet Sun,” Sol. Phys. 170, 123–141 (1997).
[CrossRef]

J. Lang, H. E. Mason, R. W. P. McWhirter, “The interpretation of the spectral line intensities from the CHASE spectrometer on spacelab 2,” Sol. Phys. 129, 31–81 (1990).
[CrossRef]

K. Wilhelm, W. Curdt, E. Marsch, U. Schühle, P. Lemaire, A. Gabriel, J.-C. Vial, M. Grewing, M. C. E. Huber, S. D. Jordan, A. I. Poland, R. J. Thomas, M. Kühne, J. G. Timothy, D. M. Hassler, O. H. W. Siegmund, “SUMER-solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
[CrossRef]

Other (5)

M. Stix, The Sun (Springer-Verlag, Berlin, 1994), Chap. 3.

H. P. Summers, “Atomic data and analysis structure,” (Culham, UK, 1994); see also http://patiala.phys.strath.ac.uk/adas .

R. A. Harrison, A. Fludra, eds., “The Coronal Diagnostic Spectrometer for the Solar and Heliospheric Observatory,” , Vers. 6 (Rutherford Appleton Laboratory, Chilton, UK, 1995).

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The EUV solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” submitted to Astrophys. J.

J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, W. T. Thompson, “The laboratory calibration of the SOHO Coronal Diagnostic Spectrometer,” (Rutherford Appleton Laboratory, Chilton, UK, 1999).

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Figures (12)

Fig. 1
Fig. 1

Sample line profiles measured with SUMER (dash–dot lines) and the corresponding fit of a Gaussian plus a constant background (solid lines): (a) He i 584-Å line profile, (b) Mg x 609-Å line profile. The Mg x 609-Å line lies on the wing of H i Lα. (c) Mg x 624-Å line profile. In these examples the fit has been made between the pixels indicated by the asterisks. Lines lying nearby could be separated by the fit.

Fig. 2
Fig. 2

Sample SUMER measurement of Mg x 624-Å line profile averaged along the slit (dash–dot line) and corresponding fit of five Gaussians plus a constant continuum background (solid line). The background is given by the dashed line.

Fig. 3
Fig. 3

Sample line profiles measured with CDS (dash–dot) and the corresponding fit of a Gaussian plus a constant background with ADAS (solid lines): (a) He i 584 Å, (b) Mg x 609 Å, (c) Mg x 624 Å.

Fig. 4
Fig. 4

Cross-correlation function of the SUMER and the CDS He i images recorded on 25 March 1996: (a) two-dimensional cross-correlation surface, (b) its profile through the maximum along the y direction.

Fig. 5
Fig. 5

Ellipsoidal Airy-like PSF used for convolution with the SUMER images: (a) surface plot on the SUMER grid; (b), (c) its profiles in the x and the y directions. This specific function corresponds to parameter b = 0.31.

Fig. 6
Fig. 6

Same as Fig. 5 but for the PSF similar to that plotted in Fig. 2 of Ref. 14.

Fig. 7
Fig. 7

Variation of the cross-correlation between the SUMER and the CDS image with the width of the Airylike PSF (width increasing toward lower b values). The horizontal lines designate the corresponding cross-correlation value calculated from convolution with the PSF shown in Fig. 6.

Fig. 8
Fig. 8

Coaligned He i 584-Å images recorded by SUMER and CDS on 25 March 1996: (a) SUMER image, (b) SUMER image resampled to the CDS pixel size, (c) SUMER image additionally convolved with the PSF, (d) CDS image.

Fig. 9
Fig. 9

Dependence of the cross-correlation coefficient of the SUMER and the CDS images on the resolution of the SUMER image.

Fig. 10
Fig. 10

Left: Histograms of the radiances of the overlapping fields of view for all data in He i 584 Å (upper plot), Mg x 609 Å (middle plot), and Mg x 624 Å (lower plot). The bin size was chosen to be 0.05 W m-2 sr-1 for He i 584 Å, 0.01 W m-2 sr-1 for Mg x 609 Å, and 0.005 W m-2 sr-1 for Mg x 624 Å. The histogram of the SUMER data is represented by the solid line, the histogram of the CDS data by the dashed line. Right: Scatter plots and linear regressions for the same data sets. The dashed lines represent the fitted curves for both regressions (SUMER versus CDS, CDS versus SUMER), and the solid line between represents their average. The dash–dotted lines represent the result from the one-parameter fit through the origin.

Fig. 11
Fig. 11

Same as in Fig. 10 for He i 584 Å. Here the SUMER data have been resampled only to match the CDS grid but not convolved with a PSF.

Fig. 12
Fig. 12

Average radiances in the overlapping fields of view at all three wavelengths. The solid lines show the CDS measurements, and the dashed lines show the SUMER measurements. The error bars give the uncertainty from the radiometric calibration of the two instruments: (a) He i 584 Å, (b) Mg x 609 Å, (c) Mg x 624 Å. The dotted lines show the results for the SUMER radiance obtained from fitting a multi-Gaussian profile obtained by averaging all individual spectra in contrast to fitting the spectra at single positions and averaging afterward. The corresponding curves for the CDS data are not given here because they show very little difference from the solid ones.

Tables (4)

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Table 1 Results of the Cross Correlation between CDS and SUMER Images

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Table 2 Regression Coefficients between SUMER and CDS from Scatter Plots for He i 584 Å (without PSF and with PSF Smoothing)

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Table 3 Regression Coefficients for Mg x 609 Å (without PSF and with PSF Smoothing)

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Table 4 Regression Coefficients for Mg x 624 Å (without PSF and with PSF Smoothing)

Equations (1)

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PSFr=1πJ1brr2,

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