Abstract

The Solar Ultraviolet Measurement of Emitted Radiation (SUMER) vacuum-ultraviolet spectrograph was calibrated in the laboratory before the integration of the instrument on the Solar and Heliospheric Observatory (SOHO) spacecraft in 1995. During the scientific operation of the SOHO it has been possible to track the radiometric calibration of the SUMER spectrograph since March 1996 by a strategy that employs various methods to update the calibration status and improve the coverage of the spectral calibration curve. The results for the A Detector were published previously [Appl. Opt. 36, 6416 (1997)]. During three years of operation in space, the B detector was used for two and one-half years. We describe the characteristics of the B detector and present results of the tracking and refinement of the spectral calibration curves with it. Observations of the spectra of the stars α and ρ Leonis permit an extrapolation of the calibration curves in the range from 125 to 149.0 nm. Using a solar coronal spectrum observed above the solar disk, we can extrapolate the calibration curves by measuring emission line pairs with well-known intensity ratios. The sensitivity ratio of the two photocathode areas can be obtained by registration of many emission lines in the entire spectral range on both KBr-coated and bare parts of the detector’s active surface. The results are found to be consistent with the published calibration performed in the laboratory in the wavelength range from 53 to 124 nm. We can extrapolate the calibration outside this range to 147 nm with a relative uncertainty of ±30% (1σ) for wavelengths longer than 125 nm and to 46.5 nm with 50% uncertainty for the short-wavelength range below 53 nm.

© 2000 Optical Society of America

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  1. 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]
  2. 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]
  3. U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, K. Wilhelm, “Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission,” Appl. Opt. 37, 2646–2652 (1998).
    [CrossRef]
  4. 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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).
  5. K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
    [CrossRef]
  6. 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]
  7. A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, 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]
  8. W. Curdt, U. Feldman, J. M. Laming, K. Wilhelm, U. Schühle, P. Lemaire, “The solar disk spectrum between 660 and 1175 (first order) obtained by SUMER on SOHO,” Astron. Astrophys. Suppl. Ser. 126, 281–296 (1997).
    [CrossRef]
  9. U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (1997).
    [CrossRef]
  10. R. C. Bohlin, A. W. Harris, A. V. Holm, C. Gry, “The ultraviolet calibration of the Hubble Space Telescope. IV. Absolute IUE fluxes of Hubble Space Telescope standard stars,” Astrophys. J. Suppl. Ser. 73, 413–439 (1990).
    [CrossRef]

1999

1998

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, K. Wilhelm, “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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

1997

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
[CrossRef]

W. Curdt, U. Feldman, J. M. Laming, K. Wilhelm, U. Schühle, P. Lemaire, “The solar disk spectrum between 660 and 1175 (first order) obtained by SUMER on SOHO,” Astron. Astrophys. Suppl. Ser. 126, 281–296 (1997).
[CrossRef]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (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

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]

1990

R. C. Bohlin, A. W. Harris, A. V. Holm, C. Gry, “The ultraviolet calibration of the Hubble Space Telescope. IV. Absolute IUE fluxes of Hubble Space Telescope standard stars,” Astrophys. J. Suppl. Ser. 73, 413–439 (1990).
[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 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (1997).
[CrossRef]

Bohlin, R. C.

R. C. Bohlin, A. W. Harris, A. V. Holm, C. Gry, “The ultraviolet calibration of the Hubble Space Telescope. IV. Absolute IUE fluxes of Hubble Space Telescope standard stars,” Astrophys. J. Suppl. Ser. 73, 413–439 (1990).
[CrossRef]

Brekke, P.

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, K. Wilhelm, “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, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
[CrossRef]

Curdt, W.

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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, K. Wilhelm, “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, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
[CrossRef]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (1997).
[CrossRef]

W. Curdt, U. Feldman, J. M. Laming, K. Wilhelm, U. Schühle, P. Lemaire, “The solar disk spectrum between 660 and 1175 (first order) obtained by SUMER on SOHO,” Astron. Astrophys. Suppl. Ser. 126, 281–296 (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]

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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

Feldman, U.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (1997).
[CrossRef]

W. Curdt, U. Feldman, J. M. Laming, K. Wilhelm, U. Schühle, P. Lemaire, “The solar disk spectrum between 660 and 1175 (first order) obtained by SUMER on SOHO,” Astron. Astrophys. Suppl. Ser. 126, 281–296 (1997).
[CrossRef]

Gabriel, A.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

Grewing, M.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

Gry, C.

R. C. Bohlin, A. W. Harris, A. V. Holm, C. Gry, “The ultraviolet calibration of the Hubble Space Telescope. IV. Absolute IUE fluxes of Hubble Space Telescope standard stars,” Astrophys. J. Suppl. Ser. 73, 413–439 (1990).
[CrossRef]

Harris, A. W.

R. C. Bohlin, A. W. Harris, A. V. Holm, C. Gry, “The ultraviolet calibration of the Hubble Space Telescope. IV. Absolute IUE fluxes of Hubble Space Telescope standard stars,” Astrophys. J. Suppl. Ser. 73, 413–439 (1990).
[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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, K. Wilhelm, “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, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

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]

Holm, A. V.

R. C. Bohlin, A. W. Harris, A. V. Holm, C. Gry, “The ultraviolet calibration of the Hubble Space Telescope. IV. Absolute IUE fluxes of Hubble Space Telescope standard stars,” Astrophys. J. Suppl. Ser. 73, 413–439 (1990).
[CrossRef]

Huber, M. C. E.

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, 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, 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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

Jordan, S. D.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

Kühne, M.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

Laming, J. M.

W. Curdt, U. Feldman, J. M. Laming, K. Wilhelm, U. Schühle, P. Lemaire, “The solar disk spectrum between 660 and 1175 (first order) obtained by SUMER on SOHO,” Astron. Astrophys. Suppl. Ser. 126, 281–296 (1997).
[CrossRef]

Lang, J.

Lemaire, P.

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, K. Wilhelm, “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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
[CrossRef]

W. Curdt, U. Feldman, J. M. Laming, K. Wilhelm, U. Schühle, P. Lemaire, “The solar disk spectrum between 660 and 1175 (first order) obtained by SUMER on SOHO,” Astron. Astrophys. Suppl. Ser. 126, 281–296 (1997).
[CrossRef]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (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]

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]

Marsch, E.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

Moran, T. M.

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (1997).
[CrossRef]

Pauluhn, A.

Paustian, W.

Pike, C. D.

Poland, A. I.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

Rüedi, I.

Schühle, U.

A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, 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, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, K. Wilhelm, “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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

W. Curdt, U. Feldman, J. M. Laming, K. Wilhelm, U. Schühle, P. Lemaire, “The solar disk spectrum between 660 and 1175 (first order) obtained by SUMER on SOHO,” Astron. Astrophys. Suppl. Ser. 126, 281–296 (1997).
[CrossRef]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (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]

Siegmund, O. H. W.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

Solanki, S. K.

Thomas, R. J.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

Thompson, W. T.

Timothy, J. G.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

Vial, J.-C.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

U. Schühle, P. Brekke, W. Curdt, J. Hollandt, P. Lemaire, K. Wilhelm, “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, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

W. Curdt, U. Feldman, J. M. Laming, K. Wilhelm, U. Schühle, P. Lemaire, “The solar disk spectrum between 660 and 1175 (first order) obtained by SUMER on SOHO,” Astron. Astrophys. Suppl. Ser. 126, 281–296 (1997).
[CrossRef]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (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]

Appl. Opt.

Astron. Astrophys.

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 the sunspot activity in 1996,” Astron. Astrophys. 334, 685–702 (1998).

Astron. Astrophys. Suppl. Ser.

W. Curdt, U. Feldman, J. M. Laming, K. Wilhelm, U. Schühle, P. Lemaire, “The solar disk spectrum between 660 and 1175 (first order) obtained by SUMER on SOHO,” Astron. Astrophys. Suppl. Ser. 126, 281–296 (1997).
[CrossRef]

Astrophys. J. Suppl. Ser.

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, T. M. Moran, “A coronal spectrum in the 500–1600 Å wavelength range recorded at a height of 21,000 kilometers above the west solar limb by the SUMER instrument on Solar and Heliospheric Observatory,” Astrophys. J. Suppl. Ser. 113, 195–219 (1997).
[CrossRef]

R. C. Bohlin, A. W. Harris, A. V. Holm, C. Gry, “The ultraviolet calibration of the Hubble Space Telescope. IV. Absolute IUE fluxes of Hubble Space Telescope standard stars,” Astrophys. J. Suppl. Ser. 73, 413–439 (1990).
[CrossRef]

Sol. Phys.

K. Wilhelm, P. Lemaire, W. Curdt, U. Schühle, E. Marsch, A. I. Poland, S. D. Jordan, R. J. Thomas, D. M. Hassler, M. C. E. Huber, J.-C. Vial, M. Kühne, O. H. W. Siegmund, A. Gabriel, J. G. Timothy, M. Grewing, U. Feldman, J. Hollandt, P. Brekke, “First results of the SUMER telescope and spectrometer on SOHO. I. Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (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]

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Figures (8)

Fig. 1
Fig. 1

Results of the laboratory calibration of the SUMER spectrograph with the B detector obtained with the lines of inert gases of the hollow-cathode source. The data points for KBr and for the bare photocathodes are connected by solid curves when they are observed in the first or the second order separately. The aperture area of the SUMER instrument is 117 cm2.

Fig. 2
Fig. 2

Flat-field correction matrix used to correct small-scale fixed pattern features of the microchannel plate detector. The matrix contains the relative pixel sensitivity values from 0.5 to 1.5. The data array was extracted with a median filter of 16 × 16 pixels from quasi-flat illumination of the detector’s field of view.

Fig. 3
Fig. 3

Radiances of the emission lines of He i (58.4 nm), Mg x (60.9 and 62.5 nm), Ne viii (77.0 nm), and N v (123.9 nm) measured during several calibration runs between 28 August 1996 and 6 November 1998. The actual dates of the measurements are given at the bottom.

Fig. 4
Fig. 4

History memory data of the B detector as of June 1998: column (top left) and row (top right) averages and map of the total accumulated counts per pixel on the detector active area (lower panel).

Fig. 5
Fig. 5

History of the B detector total accumulated counts versus time of operation and the evolution of the high-voltage increments versus accumulated counts.

Fig. 6
Fig. 6

Ratio of the two photocathode efficiencies KBr/bare. The laboratory calibration data are included for comparison with the flight data.

Fig. 7
Fig. 7

Radiometric sensitivity data of the SUMER instrument with the B detector from laboratory and flight calibrations. Data symbols for the laboratory points are as in Fig. 1. The region of overlap of first and second orders is magnified in the inset (with the sensitivity scale increased by a factor of 3). Open circles, star observation data. Asterisks, transfer of data by use of KBr/bare or first/second-order ratios. Line ratio data are marked by labels and symbols with open circles.

Fig. 8
Fig. 8

Refined spectral sensitivity for the SUMER instrument with the B detector. The curves were derived by interpolation between data points and smoothing. The relative uncertainties are valid for the KBr and bare curves and include contributions from optical stops and diffraction losses. MCP, microchannel plate.

Tables (1)

Tables Icon

Table 1 Line Ratios Measured in First and Second Orders

Metrics