Correction of Offset in the MDI/SOHO Magnetograms

Details Correction of Offset in the MDI/SOHO Magnetograms Correction of Offset in the MDI/SOHO Magnetograms

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0458l&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0458

Physics

7509 Corona, 7513 Coronal Mass Ejections, 7519 Flares, 7524 Magnetic Fields

Scientific paper

Shutter noise induces a shift of zero point in the full disk magnetograms taken by the Michelson Doppler Imager (MDI) onboard SOHO. In this paper, we suggest a method to remove this offset by using Gaussian function to fit distribution of strength of magnetic field. We also find a systematic error in 5-minute magnetogram that is sum of 5 individual magnetograms computed onboard; and this error can be corrected, too. Mean field and synoptic frame from corrected magnetograms show significant improvement. Synoptic chart is expected to be improved from systematic error in the individual data and/or from decrease of noise. This indicates that this correction is effective and necessary.

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