In-orbit determination of the straylight in the SOHO/LASCO-C2 coronagraph and its temporal evolution

A. Llebaria; J. Loirat; P. Lamy

doi:10.1117/12.926215

21 September 2012 In-orbit determination of the straylight in the SOHO/LASCO-C2 coronagraph and its temporal evolution

A. Llebaria, J. Loirat, P. Lamy

Proceedings Volume 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave; 844226 (2012) https://doi.org/10.1117/12.926215
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The LASCO-C2 coronagraph aboard SOHO (the SOlar and Heliospheric Observatory) is continuously observing the solar corona since early 1996. The instrument as well as the experimental context underwent during this period many changes and observational constraints. The consequences for the in-orbit calibration procedures are illustrated with the systematic measure of the coronagraph straylight. Disentangle the coronal signal and the straylight is the crucial point. The separation and monitoring of the straylight component rely on the daily sets of polarized observations of the corona and a minimal set of assumptions about the symmetry of the F-corona (the dust component of the solar corona). Four main changes have been detected since 1996. Specific recommendations for the in-orbit calibration of future spatial coronagraphs will be presented.

Citation Download Citation

A. Llebaria, J. Loirat, and P. Lamy "In-orbit determination of the straylight in the SOHO/LASCO-C2 coronagraph and its temporal evolution", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 844226 (21 September 2012); https://doi.org/10.1117/12.926215

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