The In-Flight Performance of the SOHO/CDS Grazing Incidence Spectrometer

Details The In-Flight Performance of the SOHO/CDS Grazing Incidence Spectrometer The In-Flight Performance of the SOHO/CDS Grazing Incidence Spectrometer

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007soph..242..187k&link_type=abstract

Solar Physics, Volume 242, Issue 1-2, pp. 187-211

Physics

3

Scientific paper

We present the characteristics, operations history, performance, and calibration of the Grazing Incidence Spectrometer (GIS) of the Coronal Diagnostic Spectrometer onboard SOHO. The GIS sensitivity has been monitored in a direct manner by examining the quiet Sun count rates during 1996 2006, nearly a whole solar cycle of observations. Overall, the instrument, with its grazing-incidence optics and microchannel plates, has performed exceptionally well. For most spectral regions, changes in the instrument sensitivity have been very small over a 10-year period. The trends in sensitivities support the use of the radiometric calibration of Del Zanna et al. ( Astron. Astrophys. 379, 708, 2001) throughout the mission. The verification of the detector performance over such a long period allows us to point out the spectral lines that can reliably be used for scientific analysis.

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