Abstract

Simultaneous observation of the same solar sources with different instruments is one way to test prelaunch radiometric calibrations and to detect changes in responsivity with time of extreme-ultraviolet instruments in space. Here we present the results of intercalibration of the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) spectrometer (detectors A and B) and the GIS (Grazing Incidence Spectrometer), one of two spectrometers that compose the CDS (Coronal Diagnostic Spectrometer) on the Solar and Heliospheric Observatory (SOHO). The two instruments observed simultaneously radiances of emission lines at or near the center of the solar disk. The emission line chosen for intercomparison was Ne viii at 770 Å. However, such an intercomparison of the SUMER and CDS-GIS measurements means comparing two data sets with large differences in resolution and field of view. The latter difference, especially, introduces differences in the measured intensities caused by the solar variability that is relatively strong in the 770-Å line. Using a statistical approach to overcome this problem, we found that the ratio of the GIS to the SUMER average radiances amounted to 2.6 ± 0.9 before the SOHO’s loss of attitude and to 2.1 ± 0.7 afterward. These findings confirm earlier estimates of the GIS’s responsivity being too low, and an update of the GIS calibration is recommended. Despite the large differences in resolution and field of view of the two instruments, the shapes of their normalized and rescaled histograms of the radiances agree well and therefore represent characteristic features of the Ne viii line.

© 2003 Optical Society of America

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    [CrossRef]

2001

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, U. Schühle, K. Wilhelm, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. II. SUMER A and B detectors and CDS NIS,” Appl. Opt. 40, 6292–6300 (2001).
[CrossRef]

G. Del Zanna, B. J. I. Bromage, E. Landi, M. Landini, “Solar EUV spectroscopic observations with SOHO/CDS. I. An in-flight calibration study,” Astron. Astrophys. 379, 708–734 (2001).
[CrossRef]

2000

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The extreme-ultraviolet solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” Astrophys. J. 536, 959–970 (2000).
[CrossRef]

A. Pauluhn, S. K. Solanki, I. Rüedi, E. Landi, U. Schühle, “Statistics of quiet Sun extreme ultraviolet intensities,” Astron. Astrophys. 362, 737–745 (2000).

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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

1999

1998

G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
[CrossRef]

1997

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21 000 kilometers above the West Solar Limb by the SUMER instrument on the Solar and Heliospheric Observatory,” Astrophys. J. Suppl. 113, 195–219 (1997).
[CrossRef]

1995

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

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. Hayes, 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]

1992

A. A. Breeveld, M. L. Edgar, A. Smith, J. S. Lapington, P. D. Thomas, “A SPAN MCP detector for the coronal diagnostic spectrometer,” Rev. Sci. Instrum. 63, 673–676 (1992).
[CrossRef]

1991

H. Geesmann, G. F. Hanne, A. D. Stauffer, J. A. Stauffer, “The dangers of digitisation. An analysis of digitised position sensitive detectors,” Nucl. Instrum. Meth. A 307, 413–419 (1991).
[CrossRef]

Al Janabi, K. F.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Behring, W. E.

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21 000 kilometers above the West Solar Limb by the SUMER instrument on the Solar and Heliospheric Observatory,” Astrophys. J. Suppl. 113, 195–219 (1997).
[CrossRef]

Bräuninger, H.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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.

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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

A. A. Breeveld, M. L. Edgar, A. Smith, J. S. Lapington, P. D. Thomas, “A SPAN MCP detector for the coronal diagnostic spectrometer,” Rev. Sci. Instrum. 63, 673–676 (1992).
[CrossRef]

A. A. Breeveld, “Ultraviolet detectors for solar observations on the SOHO spacecraft,” Ph.D. dissertation (University of London, London, 1996).

Breeveld, E. R.

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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Brekke, P.

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The extreme-ultraviolet solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” Astrophys. J. 536, 959–970 (2000).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Bromage, B. J. I.

G. Del Zanna, B. J. I. Bromage, E. Landi, M. Landini, “Solar EUV spectroscopic observations with SOHO/CDS. I. An in-flight calibration study,” Astron. Astrophys. 379, 708–734 (2001).
[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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Carter, M. K.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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. Hayes, 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, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21 000 kilometers above the West Solar Limb by the SUMER instrument on the Solar and Heliospheric Observatory,” Astrophys. J. Suppl. 113, 195–219 (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]

Cutler, R. M.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Del Zanna, G.

G. Del Zanna, B. J. I. Bromage, E. Landi, M. Landini, “Solar EUV spectroscopic observations with SOHO/CDS. I. An in-flight calibration study,” Astron. Astrophys. 379, 708–734 (2001).
[CrossRef]

G. Del Zanna, “Relative intensity calibration of CDS-GIS detectors on SOHO using a plasma diagnostic technique,” Ph.D. dissertation (University of Central Lancashire, Preston, UK, 1999).

Doschek, G. A.

G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
[CrossRef]

Edgar, M. L.

A. A. Breeveld, M. L. Edgar, A. Smith, J. S. Lapington, P. D. Thomas, “A SPAN MCP detector for the coronal diagnostic spectrometer,” Rev. Sci. Instrum. 63, 673–676 (1992).
[CrossRef]

Eparvier, F. G.

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The extreme-ultraviolet solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” Astrophys. J. 536, 959–970 (2000).
[CrossRef]

Feldman, U.

G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
[CrossRef]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21 000 kilometers above the West Solar Limb by the SUMER instrument on the Solar and Heliospheric Observatory,” Astrophys. J. Suppl. 113, 195–219 (1997).
[CrossRef]

Fludra, A.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Foley, C. R.

C. R. Foley, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Surrey, UK. (personal communication, 2002).

J. Lang, W. T. Thompson, C. D. Pike, B. J. Kent, C. R. Foley. “The calibration of the coronal diagnostic spectrometer,” in The Radiometric Calibration of SOHO, A. Pauluhn, M. C. E. Huber, R. von Steiger, eds., ISSI Sci. Rep. SR-002 (European Space Agency, Noordwijk, The Netherlands, 2002).

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. Hayes, 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]

Geesmann, H.

H. Geesmann, G. F. Hanne, A. D. Stauffer, J. A. Stauffer, “The dangers of digitisation. An analysis of digitised position sensitive detectors,” Nucl. Instrum. Meth. A 307, 413–419 (1991).
[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]

Hanne, G. F.

H. Geesmann, G. F. Hanne, A. D. Stauffer, J. A. Stauffer, “The dangers of digitisation. An analysis of digitised position sensitive detectors,” Nucl. Instrum. Meth. A 307, 413–419 (1991).
[CrossRef]

Harrison, R. A.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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.

G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
[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]

Hayes, R. W.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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.

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, U. Schühle, K. Wilhelm, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. II. SUMER A and B detectors and CDS NIS,” Appl. Opt. 40, 6292–6300 (2001).
[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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS,” Appl. Opt. 38, 7035–7046 (1999).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

U. Schühle, J. Hollandt, A. Pauluhn, K. Wilhelm, “Mid-term radiance variation of far-ultraviolet emission lines from quiet-Sun areas,” Rep. ESA SP-463 (European Space Agency, Noordwijk, The Netherlands, 2000), pp. 427–463.

Huber, M. C. E.

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, U. Schühle, K. Wilhelm, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. II. SUMER A and B detectors and CDS NIS,” Appl. Opt. 40, 6292–6300 (2001).
[CrossRef]

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS,” Appl. Opt. 38, 7035–7046 (1999).
[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]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

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. Hayes, 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.

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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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, W. T. Thompson, C. D. Pike, B. J. Kent, C. R. Foley. “The calibration of the coronal diagnostic spectrometer,” in The Radiometric Calibration of SOHO, A. Pauluhn, M. C. E. Huber, R. von Steiger, eds., ISSI Sci. Rep. SR-002 (European Space Agency, Noordwijk, The Netherlands, 2002).

Kjeldseth-Moe, O.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Kühne, M.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Laming, J. M.

G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
[CrossRef]

Landi, E.

G. Del Zanna, B. J. I. Bromage, E. Landi, M. Landini, “Solar EUV spectroscopic observations with SOHO/CDS. I. An in-flight calibration study,” Astron. Astrophys. 379, 708–734 (2001).
[CrossRef]

A. Pauluhn, S. K. Solanki, I. Rüedi, E. Landi, U. Schühle, “Statistics of quiet Sun extreme ultraviolet intensities,” Astron. Astrophys. 362, 737–745 (2000).

Landini, M.

G. Del Zanna, B. J. I. Bromage, E. Landi, M. Landini, “Solar EUV spectroscopic observations with SOHO/CDS. I. An in-flight calibration study,” Astron. Astrophys. 379, 708–734 (2001).
[CrossRef]

Lang, J.

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, U. Schühle, K. Wilhelm, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. II. SUMER A and B detectors and CDS NIS,” Appl. Opt. 40, 6292–6300 (2001).
[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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS,” Appl. Opt. 38, 7035–7046 (1999).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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, W. T. Thompson, C. D. Pike, B. J. Kent, C. R. Foley. “The calibration of the coronal diagnostic spectrometer,” in The Radiometric Calibration of SOHO, A. Pauluhn, M. C. E. Huber, R. von Steiger, eds., ISSI Sci. Rep. SR-002 (European Space Agency, Noordwijk, The Netherlands, 2002).

Lapington, J. S.

A. A. Breeveld, M. L. Edgar, A. Smith, J. S. Lapington, P. D. Thomas, “A SPAN MCP detector for the coronal diagnostic spectrometer,” Rev. Sci. Instrum. 63, 673–676 (1992).
[CrossRef]

Lemaire, P.

G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
[CrossRef]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21 000 kilometers above the West Solar Limb by the SUMER instrument on the Solar and Heliospheric Observatory,” Astrophys. J. Suppl. 113, 195–219 (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]

Maltby, P.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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. Hayes, 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]

McCalden, A. J.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Moran, T. M.

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21 000 kilometers above the West Solar Limb by the SUMER instrument on the Solar and Heliospheric Observatory,” Astrophys. J. Suppl. 113, 195–219 (1997).
[CrossRef]

Norman, K.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Parker, D. J.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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. Hayes, 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]

Pauluhn, A.

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, U. Schühle, K. Wilhelm, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. II. SUMER A and B detectors and CDS NIS,” Appl. Opt. 40, 6292–6300 (2001).
[CrossRef]

A. Pauluhn, S. K. Solanki, I. Rüedi, E. Landi, U. Schühle, “Statistics of quiet Sun extreme ultraviolet intensities,” Astron. Astrophys. 362, 737–745 (2000).

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS,” Appl. Opt. 38, 7035–7046 (1999).
[CrossRef]

U. Schühle, J. Hollandt, A. Pauluhn, K. Wilhelm, “Mid-term radiance variation of far-ultraviolet emission lines from quiet-Sun areas,” Rep. ESA SP-463 (European Space Agency, Noordwijk, The Netherlands, 2000), pp. 427–463.

Payne, 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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Peskett, S. C.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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.

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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS,” Appl. Opt. 38, 7035–7046 (1999).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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, W. T. Thompson, C. D. Pike, B. J. Kent, C. R. Foley. “The calibration of the coronal diagnostic spectrometer,” in The Radiometric Calibration of SOHO, A. Pauluhn, M. C. E. Huber, R. von Steiger, eds., ISSI Sci. Rep. SR-002 (European Space Agency, Noordwijk, The Netherlands, 2002).

Poland, A. I.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Richards, A. G.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

Rüedi, I.

Sawyer, E. C.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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.

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, U. Schühle, K. Wilhelm, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. II. SUMER A and B detectors and CDS NIS,” Appl. Opt. 40, 6292–6300 (2001).
[CrossRef]

A. Pauluhn, S. K. Solanki, I. Rüedi, E. Landi, U. Schühle, “Statistics of quiet Sun extreme ultraviolet intensities,” Astron. Astrophys. 362, 737–745 (2000).

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS,” Appl. Opt. 38, 7035–7046 (1999).
[CrossRef]

G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
[CrossRef]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21 000 kilometers above the West Solar Limb by the SUMER instrument on the Solar and Heliospheric Observatory,” Astrophys. J. Suppl. 113, 195–219 (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]

U. Schühle, J. Hollandt, A. Pauluhn, K. Wilhelm, “Mid-term radiance variation of far-ultraviolet emission lines from quiet-Sun areas,” Rep. ESA SP-463 (European Space Agency, Noordwijk, The Netherlands, 2000), pp. 427–463.

Self, D. G.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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. Hayes, 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]

Smith, A.

A. A. Breeveld, M. L. Edgar, A. Smith, J. S. Lapington, P. D. Thomas, “A SPAN MCP detector for the coronal diagnostic spectrometer,” Rev. Sci. Instrum. 63, 673–676 (1992).
[CrossRef]

Solanki, S. K.

Stauffer, A. D.

H. Geesmann, G. F. Hanne, A. D. Stauffer, J. A. Stauffer, “The dangers of digitisation. An analysis of digitised position sensitive detectors,” Nucl. Instrum. Meth. A 307, 413–419 (1991).
[CrossRef]

Stauffer, J. A.

H. Geesmann, G. F. Hanne, A. D. Stauffer, J. A. Stauffer, “The dangers of digitisation. An analysis of digitised position sensitive detectors,” Nucl. Instrum. Meth. A 307, 413–419 (1991).
[CrossRef]

Summers, H. P.

H. P. Summers, “Atomic data and analysis structure,” JET Joint Undertaking Rep. JET̲IR(94)06, Culham, UK. (1994); The Adas manual, version 2–3, http://adas.phys.strath.ac.uk/ (2001).

Thomas, P. D.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

A. A. Breeveld, M. L. Edgar, A. Smith, J. S. Lapington, P. D. Thomas, “A SPAN MCP detector for the coronal diagnostic spectrometer,” Rev. Sci. Instrum. 63, 673–676 (1992).
[CrossRef]

Thomas, R. J.

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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.

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, U. Schühle, K. Wilhelm, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. II. SUMER A and B detectors and CDS NIS,” Appl. Opt. 40, 6292–6300 (2001).
[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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The extreme-ultraviolet solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” Astrophys. J. 536, 959–970 (2000).
[CrossRef]

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS,” Appl. Opt. 38, 7035–7046 (1999).
[CrossRef]

R. A. Harrison, E. C. Sawyer, M. K. Carter, A. M. Cruise, R. M. Cutler, A. Fludra, R. W. Hayes, 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]

W. T. Thompson, L3 Communications Emergent East, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771 (personal communication, 2002).

J. Lang, W. T. Thompson, C. D. Pike, B. J. Kent, C. R. Foley. “The calibration of the coronal diagnostic spectrometer,” in The Radiometric Calibration of SOHO, A. Pauluhn, M. C. E. Huber, R. von Steiger, eds., ISSI Sci. Rep. SR-002 (European Space Agency, Noordwijk, The Netherlands, 2002).

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]

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]

Wilhelm, K.

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, U. Schühle, K. Wilhelm, W. T. Thompson, J. Hollandt, M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. II. SUMER A and B detectors and CDS NIS,” Appl. Opt. 40, 6292–6300 (2001).
[CrossRef]

G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
[CrossRef]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21 000 kilometers above the West Solar Limb by the SUMER instrument on the Solar and Heliospheric Observatory,” Astrophys. J. Suppl. 113, 195–219 (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]

U. Schühle, J. Hollandt, A. Pauluhn, K. Wilhelm, “Mid-term radiance variation of far-ultraviolet emission lines from quiet-Sun areas,” Rep. ESA SP-463 (European Space Agency, Noordwijk, The Netherlands, 2000), pp. 427–463.

Woods, T. N.

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The extreme-ultraviolet solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” Astrophys. J. 536, 959–970 (2000).
[CrossRef]

Appl. Opt.

Astron. Astrophys.

A. Pauluhn, S. K. Solanki, I. Rüedi, E. Landi, U. Schühle, “Statistics of quiet Sun extreme ultraviolet intensities,” Astron. Astrophys. 362, 737–745 (2000).

G. Del Zanna, B. J. I. Bromage, E. Landi, M. Landini, “Solar EUV spectroscopic observations with SOHO/CDS. I. An in-flight calibration study,” Astron. Astrophys. 379, 708–734 (2001).
[CrossRef]

Astrophys. J.

G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
[CrossRef]

P. Brekke, W. T. Thompson, T. N. Woods, F. G. Eparvier, “The extreme-ultraviolet solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” Astrophys. J. 536, 959–970 (2000).
[CrossRef]

Astrophys. J. Suppl.

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21 000 kilometers above the West Solar Limb by the SUMER instrument on the Solar and Heliospheric Observatory,” Astrophys. J. Suppl. 113, 195–219 (1997).
[CrossRef]

J. Opt. A

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,” J. Opt. A 2, 88–106 (2000).
[CrossRef]

Nucl. Instrum. Meth. A

H. Geesmann, G. F. Hanne, A. D. Stauffer, J. A. Stauffer, “The dangers of digitisation. An analysis of digitised position sensitive detectors,” Nucl. Instrum. Meth. A 307, 413–419 (1991).
[CrossRef]

Rev. Sci. Instrum.

A. A. Breeveld, M. L. Edgar, A. Smith, J. S. Lapington, P. D. Thomas, “A SPAN MCP detector for the coronal diagnostic spectrometer,” Rev. Sci. Instrum. 63, 673–676 (1992).
[CrossRef]

Sol. Phys.

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Figures (9)

Fig. 1
Fig. 1

Sample Ne viii 770-Å image (32” × 32”) measured with the SUMER spectrometer and CDS-GIS on 26 August 1996. “Smoothed” here means that the number of pixels has been increased by a factor of 4 in both directions and the pixels between the original ones have been linearly interpolated as done by the IDL function, rebin.

Fig. 2
Fig. 2

Surface plots of the radiances in the common field of view (see Fig. 1): (a) SUMER, (b) CDS-GIS.

Fig. 3
Fig. 3

Averaged radiances over the entire 4 years: (a) All data for CDS-GIS (stars) and SUMER (squares). b) Simultaneous measurements. Vertical lines, date when contact with the SOHO spacecraft was lost and normal operations were interrupted for approximately 3 months. In this and subsequent figures the month/day/year numeral system for writing dates is used.

Fig. 4
Fig. 4

Ratio of GIS average radiances to SUMER averages versus time. The average ratios before and after loss are given as solid lines; the linear fits, as dashed-dotted lines. The uncertainties are indicated in the text.

Fig. 5
Fig. 5

Comparison of the averaged radiances, CDS-GIS measurements have been rescaled with the recommended factor 2.6. The vertical lines indicate the date when contact with the SOHO spacecraft was lost. (a) Simultaneous CDS-GIS (stars) and SUMER (squares) measurements. (b) Successive measurements taken in 1 day by the GIS and the SUMER spectrometer combined to form one data point per date of measurement per instrument to smooth some of the variability.

Fig. 6
Fig. 6

Histograms and the corresponding log normal fits of all SUMER and CDS-GIS radiances.

Fig. 7
Fig. 7

Log normal fits to the histograms of all SUMER and CDS-GIS radiances for four time periods.

Fig. 8
Fig. 8

Histograms of all SUMER and CDS-GIS radiances for four time periods, normalized and scaled to common mean values.

Fig. 9
Fig. 9

Variation of the parameters of the log normal distribution with the SUMER resolution. Shown also are a least-squares fit to the data and the uncertainty margins. The corresponding parameters of the CDS distribution are indicated by diamonds. For this comparison, only a subset of SUMER and CDS data was used, namely, those data with true SUMER raster scans, to permit us to start from SUMER’s full resolution.

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