STEREO COR1-A/B Intercalibration at 180 Degrees Seperation

Details STEREO COR1-A/B Intercalibration at 180 Degrees Seperation STEREO COR1-A/B Intercalibration at 180 Degrees Seperation

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1513t&link_type=abstract

American Astronomical Society, SPD meeting #42, #15.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

The two STEREO spacecraft achieved 180 degree separation on 6 February 2011. This allows the first-ever view of the entire Sun. Another advantage of being at 180 degree separation is that it serves as a unique opportunity to check the cross-calibration of the STEREO telescopes. At 180 degrees, both spacecraft see the same corona from opposite sides. Where the corona is optically thin, the images from the two spacecraft should appear as mirror images of each other. We analyze the COR1 data from the time of opposition, and show that the COR1-A and COR1-B images agree with each other to a high degree of accuracy, thus validating both the radiometric intercalibration, and the background subtraction methodology. We also show from stellar observations that the COR1 radiometric calibrations have not changed since launch.

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