Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1515j&link_type=abstract
American Astronomical Society, SPD meeting #42, #15.15; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Most user interest in the SOLIS Vector Spectromagnetograph (VSM) centers on full-disk vector and longitudinal magnetograms which are used for many purposes including flare prediction, field extrapolation, and studies of the solar cycle. However, pseudo-continuum intensity, line-depth, and equivalent-width images, which are perfectly registered both in time and space with their corresponding magnetograms, are carried with the standard SOLIS data analysis to Level 1 (flat-fielding and sorting of individual scan lines into "raw" images). These quantities potentially provide important thermodynamic information which improve feature identification and inform models of photospheric and chromospheric structures, but the raw images contain many defects which prevent their direct use. Least-squares spline and polynomial algorithms are presented for compputing contrast images which are free of both these defects and center-to-limb variation.
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