In-orbit performances of the EIT instrument on board SOHO and intercalibration with the EIT Calroc Sounding Rocket program

Jean-Marc Defise; J. Daniel Moses; Frederic Clette

doi:10.1117/12.330249

2 November 1998 In-orbit performances of the EIT instrument on board SOHO and intercalibration with the EIT Calroc Sounding Rocket program

Jean-Marc Defise, J. Daniel Moses, Frederic Clette

Author Affiliations +

Proceedings Volume 3442, Missions to the Sun II; (1998) https://doi.org/10.1117/12.330249
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

The Extreme UV Imaging Telescope (EIT) instrument is operating on-board the SOHO spacecraft since January 1996. EIT is providing EUV observations of the solar corona in four narrow channels: 171, 195, 284 and 304 angstrom. Due to continuous exposure to the EUV solar irradiation, the instrument performance is continuously evolving. The backside thinned detector is showing important changes in its overall response and local damage of EUV highly exposed areas. These performance modifications can be characterized through several observation analyses that are discussed in this paper. Two major effects are identified: contamination on the detector surface and charge mobility changes in the CCD produced by the EUV irradiation. To restore the instrument response, bakeouts are regularly planned as well as specific observation sequences that are used to characterize the detector damages. An overview of the instrument response behavior is presented in this paper.

Citation Download Citation

Jean-Marc Defise, J. Daniel Moses, and Frederic Clette "In-orbit performances of the EIT instrument on board SOHO and intercalibration with the EIT Calroc Sounding Rocket program", Proc. SPIE 3442, Missions to the Sun II, (2 November 1998); https://doi.org/10.1117/12.330249

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