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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 4 — Feb. 1, 2003
  • pp: 657–666

Intercalibration of SUMER and CDS on SOHO. III. SUMER and CDS-GIS

Anuschka Pauluhn, Jim Lang, Eddie R. Breeveld, Sami K. Solanki, and Udo Schühle  »View Author Affiliations


Applied Optics, Vol. 42, Issue 4, pp. 657-666 (2003)
http://dx.doi.org/10.1364/AO.42.000657


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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

OCIS Codes
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6540) Spectroscopy : Spectroscopy, ultraviolet

Citation
Anuschka Pauluhn, Jim Lang, Eddie R. Breeveld, Sami K. Solanki, and Udo Schühle, "Intercalibration of SUMER and CDS on SOHO. III. SUMER and CDS-GIS," Appl. Opt. 42, 657-666 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-4-657


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References

  1. B. Fleck, V. Domingo, and A. Poland, eds., “The SOHO Mission,” Sol. Phys. 162(1–2) (1995).
  2. A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, C. D. Pike, U. Schühle, W. T. Thompson, J. Hollandt, and M. C. E. Huber, “Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS,” Appl. Opt. 38, 7035–7046 (1999).
  3. A. Pauluhn, I. Rüedi, S. K. Solanki, J. Lang, U. Schühle, K. Wilhelm, W. T. Thompson, J. Hollandt, and 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).
  4. 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, and O. H. W. Siegmund, “SUMER—solar ultraviolet measurements of emitted radiation,” Sol. Phys. 162, 189–231 (1995).
  5. U. Schühle, J. Hollandt, A. Pauluhn, and 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.
  6. 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, and B. J. I. Bromage, “The coronal diagnostic spectrometer for the solar and heliospheric observatory,” Sol. Phys. 162, 233–290 (1995).
  7. A. A. Breeveld, M. L. Edgar, A. Smith, J. S. Lapington, and P. D. Thomas, “A SPAN MCP detector for the coronal diagnostic spectrometer,” Rev. Sci. Instrum. 63, 673–676 (1992).
  8. A. A. Breeveld, “Ultraviolet detectors for solar observations on the SOHO spacecraft,” Ph.D. dissertation (University of London, London, 1996).
  9. R. D. Bentley, “CDS-GIS instrument guide,” CDS Software Note 54, version 1 (1999), http://orpheus.nascom.nasa.gov/cds/software_notes.html.
  10. E. R. Breeveld, “GIS software user manual,” CDS Software Note 55, version 4 (2000), http://orpheus.nascom.nasa.gov/cds/software_notes.html.
  11. E. R. Breeveld, “GIS calibration details,” CDS Software Note 56, version 1 (2000), http://orpheus.nascom.nasa.gov/cds/software_notes.html.
  12. H. Geesmann, G. F. Hanne, A. D. Stauffer, and J. A. Stauffer, “The dangers of digitisation. An analysis of digitised position sensitive detectors,” Nucl. Instrum. Meth. A 307, 413–419 (1991).
  13. U. Feldman, W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, P. Lemaire, and 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).
  14. C. R. Foley, Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Surrey, UK. (personal communication, 2002).
  15. H. P. Summers, “Atomic data and analysis structure,” JET Joint Undertaking Rep. JET_IR(94)06, Culham, UK. (1994); The Adas manual, version 2–3, http://adas.phys.strath.ac.uk/ (2001).
  16. J. Lang, B. J. Kent, A. A. Breeveld, E. R. Breeveld, B. J. I. Bromage, J. Hollandt, J. Payne, C. D. Pike, and W. T. Thompson, “The laboratory calibration of the SOHO coronal diagnostic spectrometer,” J. Opt. A 2, 88–106 (2000).
  17. G. A. Doschek, J. M. Laming, U. Feldman, K. Wilhelm, P. Lemaire, U. Schühle, and D. M. Hassler, “The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions,” Astrophys. J. 504, 573–587 (1998).
  18. A. Pauluhn, S. K. Solanki, I. Rüedi, E. Landi, and U. Schühle, “Statistics of quiet Sun extreme ultraviolet intensities,” Astron. Astrophys. 362, 737–745 (2000).
  19. G. Del Zanna, B. J. I. Bromage, E. Landi, and M. Landini, “Solar EUV spectroscopic observations with SOHO/CDS. I. An in-flight calibration study,” Astron. Astrophys. 379, 708–734 (2001).
  20. J. Lang, W. T. Thompson, C. D. Pike, B. J. Kent, and C. R. Foley. “The calibration of the coronal diagnostic spectrometer,” in The Radiometric Calibration of SOHO, A. Pauluhn, M. C. E. Huber, and R. von Steiger, eds., ISSI Sci. Rep. SR-002(European Space Agency, Noordwijk, The Netherlands, 2002).
  21. W. T. Thompson, L3 Communications Emergent East, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771 (personal communication, 2002).
  22. 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).
  23. P. Brekke, W. T. Thompson, T. N. Woods, and F. G. Eparvier, “The extreme-ultraviolet solar irradiance spectrum observed with the Coronal Diagnostic Spectrometer (CDS) on SOHO,” Astrophys. J. 536, 959–970 (2000).

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