Solar and Heliospheric Observatory/Large Angle Spectrometric Coronagraph Polarimetric Calibration |
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| Authors: | Thomas G Moran Joseph M Davila Jeff S Morrill Dennis Wang Russel Howard |
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| Institution: | (1) The Catholic University of America, Washington, DC, 20064, U.S.A.;(2) NASA/GSFC, Code 612.5, Greenbelt, MD, 20771, U.S.A.;(3) Space Science Division, Naval Research Laboratory, MC 7660, 4555 Overlook Avenue, S.W., Washington, DC, 20375, U.S.A. |
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| Abstract: | We present a polarimetric characterization and correction for the Solar and Heliospheric Observatory/Large Angle Spectrometric
Coronagraph (SOHO/LASCO) C2 and C3 white light coronagraphs. By measuring the uncorrected polarization angles in solar minimum
C2 coronal images, we have determined that the coronagraph acts as an optical phase retarder which converts a small fraction
of the incoming radiation polarization from linear to circular. In addition, from the measurements of polarization angle in
C3 coronal images we have determined that a component of the instrumentally scattered light in that instrument is polarized.
We infer the retardation angle for C2 and compute the corresponding Mueller matrix, and determine the polarized stray light
spatial profile in C3. The C2 Mueller matrix and C3 polarized stray light profiles are used to correct for instrumental effects
in solar minimum coronal observations to obtain polarized brightness between two and thirty-two solar radii, which show deep
polar coronal holes extending to the limit of the field of view. |
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