Saturation Effect Seen In The MDI/SOHO Magnetograms

Details Saturation Effect Seen In The MDI/SOHO Magnetograms Saturation Effect Seen In The MDI/SOHO Magnetograms

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0715l&link_type=abstract

American Astronomical Society, SPD meeting #37, #7.15; Bulletin of the American Astronomical Society, Vol. 38, p.230

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Saturation phenomenon is sometimes seen in the sunspots' umbrae in SOHO/MDI magnetograms. In this paper, we present a research on understanding the cause for this saturation. By using a set of MDI line profile campaign data, we simulated the MDI measurement of magnetic field, and compared it with one MDI magnetogram taken some times apart of this line-profile data set. We found that the saturation areas shown in the MDI magnetogram don't appear in the simulated magnetogram from the line-profile data. We conclude that very low intensity in the sunspots' umbrae that leads to failure of on-board computation, is the reason causing the saturation.

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