Solar rotation rate at high latitude measured by MDI magnetograms

Details Solar rotation rate at high latitude measured by MDI magnetograms Solar rotation rate at high latitude measured by MDI magnetograms

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh51a1592l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH51A-1592

Physics

7524 Magnetic Fields, 7529 Photosphere

Scientific paper

Using MDI 1-minute cadence magnetograms taken by a campaign program in March 2008, we study solar rotation rate at high latitude using an image cross correlation technique. The MDI magnetograms are first remapped onto the heliographic coordinates, and then averaged by 60 individual magnetograms in order to increase the ratio of signal-to-noise. The final data thus has a temporal resolution of 60 minutes. We compare our results with previous studies that usually measured the rotation rate in low latitude only, and also place a discussion here. SOHO is a project of international cooperation between ESA and NASA.

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