Hinode SP Vector Magnetogram of AR10930 and Its Cross-Comparison with MDI

Details Hinode SP Vector Magnetogram of AR10930 and Its Cross-Comparison with MDI Hinode SP Vector Magnetogram of AR10930 and Its Cross-Comparison with MDI

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59s.625m&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.59, No.SP3, pp.S625--S630

Astronomy and Astrophysics

Astronomy

10

Sun: Magnetic Fields, Sun: Photosphere, Sun: Sunspots

Scientific paper

We present one Hinode Spectropolarimeter (SP) magnetogram of AR 10930 that produced several major flares. The inversion from Stokes profiles to magnetic field vectors was made using the standard Milne-Eddington code. We successfully applied the Uniform Shear Method for resolving the 180° ambiguity to the magnetogram. The inversion gave very strong magnetic field strengths (near 4500 gauss) for a small portion of area in the umbra. Considering that the observed V-profile of 6301.5Å was well-fitted as well as a direct estimation of the Zeeman splitting results in 4300-4600 gauss, we think that the field strengths should not be far from the actual value. A cross-comparison of the Hinode SP and SOHO MDI high resolution flux densities shows that the MDI flux density could be significantly underestimated by about a factor of two. In addition, it has a serious negative correlation (the so-called Zeeman saturation effect) with the Hinode SP flux density for umbral regions. Finally, we could successfully obtain a recalibrated MDI magnetogram that has been corrected for the Zeeman saturation effect using not only a pair of MDI intensity and magnetogram data simultaneously observed, but also the relationship from the cross-comparison between the Hinode SP and MDI flux densities.

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