Straylight-Rejection Performance of the STEREO HI Instruments

Details Straylight-Rejection Performance of the STEREO HI Instruments Straylight-Rejection Performance of the STEREO HI Instruments

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011soph..271..197h&link_type=abstract

Solar Physics, Volume 271, Issue 1-2, pp. 197-218

Physics

1

Straylight, Lens Barrel Rejection, Mean Solar Brightness, Off-Pointing

Scientific paper

The SECCHI Heliospheric Imager (HI) instruments on-board the STEREO spacecraft have been collecting images of solar wind transients, including coronal mass ejections, as they propagate through the inner heliosphere since the beginning of 2007. The scientific use of the images depends critically on the performance of the instruments and its evolution over time. One of the most important factors affecting the performance of the instrument is the rejection of straylight from the Sun and from other bright objects located both within and outside the HI fields of view. This paper presents an analysis of the evolution of the straylight-rejection performance of the HI instrument on each of the two STEREO spacecraft over the three first years of the mission. The straylight level has been evaluated and expressed in mean solar brightness units, in which such scientific observations are usually quoted, using photometric conversion factors.

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