Abstract

The radiometric calibration of the solar telescope and spectrometer SUMERwas carried out in the laboratory before delivery of the instrument for integration into the SOHO (Solar and Heliospheric Observatory) spacecraft. Although this effort led to a reasonable coverage of the wavelength range from 53.70 to 146.96 nm, uncalibrated portions of the sensitivity curves remained before SUMER became operational in early 1996. Thereafter it was possible to perform extrapolations and interpolations of the calibration curves of detector A to shorter, longer, and intermediate wavelengths by using emission line pairs with known intensity ratios. The spectra of the stars α and ρ Leonis were also observed on the KBr (potassium bromide) photocathode and the bare microchannel plate (MCP) in the range from 120 to 158 nm. In addition, the sensitivity ratios of the KBr photocathode to the bare MCP were determined for many solar lines as well as the H i Lyman and the thermal continua. The results have been found to be consistent with published laboratory data. The uncertainty is ±15% (1 σ) in the wavelength range from 54 to 125 nm.

© 1997 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. R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (1997).
    [CrossRef]
  3. T. T. Saha, D. B. Leviton, P. Glenn, “Performance of ion-figured silicon carbide SUMER telescope mirror in the vacuum ultraviolet,” Appl. Opt. 35, 1741–1750 (1996).
    [CrossRef]
  4. 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]
  5. J. Hollandt, M. Kühne, M. C. E. Huber, B. Wende, “Source standards for the radiometric calibration of astronomical telescopes in the VUV spectral range,” Astron. Astrophys. Suppl. 115, 561–572 (1996).
  6. F. Riehle, B. Wende, “Electron storage ring BESSY as a radiometric source of calculable spectral radiant power between 0.5 and 1000 nm,” Opt. Lett. 10, 365–367 (1985).
    [CrossRef]
  7. 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—solar ultraviolet measurements of emitted radiation—on SOHO, (I) Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
    [CrossRef]
  8. F. P. Keenan, K. A. Berrington, P. G. Burke, A. E. Kingston, P. L. Dufton, “Level populations for Be-sequence ions in astrophysical plasmas,” Mon. Not. R. Astron. Soc. 207, 459–463 (1984).
  9. U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21000 km above the west solar limb by the SUMER instrument on SOHO,” Astrophys. J. Suppl. 113 (1) (1992).
  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. 73, 413–439 (1990).
    [CrossRef]

1997

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (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—solar ultraviolet measurements of emitted radiation—on SOHO, (I) Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
[CrossRef]

1996

T. T. Saha, D. B. Leviton, P. Glenn, “Performance of ion-figured silicon carbide SUMER telescope mirror in the vacuum ultraviolet,” Appl. Opt. 35, 1741–1750 (1996).
[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]

J. Hollandt, M. Kühne, M. C. E. Huber, B. Wende, “Source standards for the radiometric calibration of astronomical telescopes in the VUV spectral range,” Astron. Astrophys. Suppl. 115, 561–572 (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]

1992

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21000 km above the west solar limb by the SUMER instrument on SOHO,” Astrophys. J. Suppl. 113 (1) (1992).

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. 73, 413–439 (1990).
[CrossRef]

1985

1984

F. P. Keenan, K. A. Berrington, P. G. Burke, A. E. Kingston, P. L. Dufton, “Level populations for Be-sequence ions in astrophysical plasmas,” Mon. Not. R. Astron. Soc. 207, 459–463 (1984).

Behring, W. E.

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21000 km above the west solar limb by the SUMER instrument on SOHO,” Astrophys. J. Suppl. 113 (1) (1992).

Berrington, K. A.

F. P. Keenan, K. A. Berrington, P. G. Burke, A. E. Kingston, P. L. Dufton, “Level populations for Be-sequence ions in astrophysical plasmas,” Mon. Not. R. Astron. Soc. 207, 459–463 (1984).

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. 73, 413–439 (1990).
[CrossRef]

Boucarut, R. A.

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (1997).
[CrossRef]

Brekke, P.

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—solar ultraviolet measurements of emitted radiation—on SOHO, (I) Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
[CrossRef]

Burke, P. G.

F. P. Keenan, K. A. Berrington, P. G. Burke, A. E. Kingston, P. L. Dufton, “Level populations for Be-sequence ions in astrophysical plasmas,” Mon. Not. R. Astron. Soc. 207, 459–463 (1984).

Curdt, 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—solar ultraviolet measurements of emitted radiation—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]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21000 km above the west solar limb by the SUMER instrument on SOHO,” Astrophys. J. Suppl. 113 (1) (1992).

Dufton, P. L.

F. P. Keenan, K. A. Berrington, P. G. Burke, A. E. Kingston, P. L. Dufton, “Level populations for Be-sequence ions in astrophysical plasmas,” Mon. Not. R. Astron. Soc. 207, 459–463 (1984).

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—solar ultraviolet measurements of emitted radiation—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, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21000 km above the west solar limb by the SUMER instrument on SOHO,” Astrophys. J. Suppl. 113 (1) (1992).

Fleetwood, C. M.

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (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—solar ultraviolet measurements of emitted radiation—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]

Glenn, P.

T. T. Saha, D. B. Leviton, P. Glenn, “Performance of ion-figured silicon carbide SUMER telescope mirror in the vacuum ultraviolet,” Appl. Opt. 35, 1741–1750 (1996).
[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—solar ultraviolet measurements of emitted radiation—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. 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. 73, 413–439 (1990).
[CrossRef]

Hassler, D. 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—solar ultraviolet measurements of emitted radiation—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, 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—solar ultraviolet measurements of emitted radiation—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]

J. Hollandt, M. Kühne, M. C. E. Huber, B. Wende, “Source standards for the radiometric calibration of astronomical telescopes in the VUV spectral range,” Astron. Astrophys. Suppl. 115, 561–572 (1996).

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. 73, 413–439 (1990).
[CrossRef]

Huber, M. C. 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—solar ultraviolet measurements of emitted radiation—on SOHO, (I) Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
[CrossRef]

J. Hollandt, M. Kühne, M. C. E. Huber, B. Wende, “Source standards for the radiometric calibration of astronomical telescopes in the VUV spectral range,” Astron. Astrophys. Suppl. 115, 561–572 (1996).

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—solar ultraviolet measurements of emitted radiation—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]

Keenan, F. P.

F. P. Keenan, K. A. Berrington, P. G. Burke, A. E. Kingston, P. L. Dufton, “Level populations for Be-sequence ions in astrophysical plasmas,” Mon. Not. R. Astron. Soc. 207, 459–463 (1984).

Keski-Kuha, R. A. M.

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (1997).
[CrossRef]

Kingston, A. E.

F. P. Keenan, K. A. Berrington, P. G. Burke, A. E. Kingston, P. L. Dufton, “Level populations for Be-sequence ions in astrophysical plasmas,” Mon. Not. R. Astron. Soc. 207, 459–463 (1984).

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—solar ultraviolet measurements of emitted radiation—on SOHO, (I) Spectra and spectroradiometry,” Sol. Phys. 170, 75–104 (1997).
[CrossRef]

J. Hollandt, M. Kühne, M. C. E. Huber, B. Wende, “Source standards for the radiometric calibration of astronomical telescopes in the VUV spectral range,” Astron. Astrophys. Suppl. 115, 561–572 (1996).

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]

Lemaire, P.

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—solar ultraviolet measurements of emitted radiation—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]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21000 km above the west solar limb by the SUMER instrument on SOHO,” Astrophys. J. Suppl. 113 (1) (1992).

Leviton, D. B.

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (1997).
[CrossRef]

T. T. Saha, D. B. Leviton, P. Glenn, “Performance of ion-figured silicon carbide SUMER telescope mirror in the vacuum ultraviolet,” Appl. Opt. 35, 1741–1750 (1996).
[CrossRef]

Madison, T. J.

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (1997).
[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—solar ultraviolet measurements of emitted radiation—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]

Osantowski, J. F.

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (1997).
[CrossRef]

Paustian, W.

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—solar ultraviolet measurements of emitted radiation—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]

Riehle, F.

Saha, T. T.

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (1997).
[CrossRef]

T. T. Saha, D. B. Leviton, P. Glenn, “Performance of ion-figured silicon carbide SUMER telescope mirror in the vacuum ultraviolet,” Appl. Opt. 35, 1741–1750 (1996).
[CrossRef]

Schühle, 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—solar ultraviolet measurements of emitted radiation—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]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21000 km above the west solar limb by the SUMER instrument on SOHO,” Astrophys. J. Suppl. 113 (1) (1992).

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—solar ultraviolet measurements of emitted radiation—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]

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—solar ultraviolet measurements of emitted radiation—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]

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—solar ultraviolet measurements of emitted radiation—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—solar ultraviolet measurements of emitted radiation—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, 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—solar ultraviolet measurements of emitted radiation—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]

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21000 km above the west solar limb by the SUMER instrument on SOHO,” Astrophys. J. Suppl. 113 (1) (1992).

Wright, G. A.

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (1997).
[CrossRef]

Appl. Opt.

T. T. Saha, D. B. Leviton, P. Glenn, “Performance of ion-figured silicon carbide SUMER telescope mirror in the vacuum ultraviolet,” Appl. Opt. 35, 1741–1750 (1996).
[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]

Astron. Astrophys. Suppl.

J. Hollandt, M. Kühne, M. C. E. Huber, B. Wende, “Source standards for the radiometric calibration of astronomical telescopes in the VUV spectral range,” Astron. Astrophys. Suppl. 115, 561–572 (1996).

Astrophys. J. Suppl.

U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, “A coronal spectrum in the 500–1610 Å wavelength range recorded at a height of 21000 km above the west solar limb by the SUMER instrument on SOHO,” Astrophys. J. Suppl. 113 (1) (1992).

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. 73, 413–439 (1990).
[CrossRef]

Mon. Not. R. Astron. Soc.

F. P. Keenan, K. A. Berrington, P. G. Burke, A. E. Kingston, P. L. Dufton, “Level populations for Be-sequence ions in astrophysical plasmas,” Mon. Not. R. Astron. Soc. 207, 459–463 (1984).

Opt. Eng.

R. A. M. Keski-Kuha, J. F. Osantowski, D. B. Leviton, T. T. Saha, G. A. Wright, R. A. Boucarut, C. M. Fleetwood, T. J. Madison, “Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications,” Opt. Eng. 36, 157–161 (1997).
[CrossRef]

Opt. Lett.

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—solar ultraviolet measurements of emitted radiation—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 (4)

Fig. 1
Fig. 1

(a) Sensitivity of SUMER with detector A, obtained from the radiometric calibration with lines of inert gases. The data points(open squares) for the KBr photocathode and (open triangles) the bare MCPwere measured in the laboratory before delivery of the instrument to ESA for integration into SOHO. The first and the second orders of diffraction overlap from 78.0 to 80.5 nm for this detector. The filled symbols indicate calibration points that changed slightly after a reevaluation of the laboratory measurements with xenon. (b) Ratio of the KBr/bare MCPsensitivities with detector A for the calibration lines of (a) (open circles)and (crosses) other uncalibrated lines determined before launch. Values changed in the reevaluation process are indicated by filled circles.

Fig. 2
Fig. 2

Ratio of the KBr/bare MCP sensitivities measured in flight. Various methods were employed as explained in the text. Ratios derived by comparison of emission-line signals on both photocathodes are shown as diamonds, and ratios for specific lines as the square (He i) and the triangle(N ii). A cross indicates the ratio measured in the wing of H i Lyman α. Star observations on KBr and the bare MCP gave ratios depicted by stars. The H i Lyman continuum data are marked by plus signs, and the thermal continuum data by circles. To demonstrate the level of agreement with prelaunch values, the data points of Fig. 1(b) are repeated here as small dots.

Fig. 3
Fig. 3

Summary plot of the SUMER absolute radiometric calibration of detector A. Open or filled squares refer to the KBr photocathode and triangles to the bare MCP. The overlap region of the first and second orders and its environment are magnified from74 to 82 nm in the inset (with a sensitivity scale changed by a factor of 10). Star observations are marked by stars and line ratio data by encircled squares or triangles. The question mark at 146 nm highlights the only inconsistency found in this analysis.

Fig. 4
Fig. 4

Spectral sensitivity of the SUMER instrument with its detector A and the corresponding uncertainties for slit 2. On the long-wavelength side, the uncertainty refers only to the KBr photocathode and at short wavelengths to the bare MCP. Note that the uncertainties given in this diagram include the error contributions of optical stops and diffraction effects. They can be considered system characteristics of SUMER in the configuration defined above, but the pixel size uncertainty has to be treated separately.

Tables (2)

Tables Icon

Table 1 Some Optical Characteristics of SUMERa

Tables Icon

Table 2 Line Pairs Arranged in Iso-electronic Sequences and Their Theoretical Intensity Ratios Together with the Derived Sensitivitiesa

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