A Cross-Comparison of Cotemporal Magnetograms Obtained with MDI/SOHO and SP/<Emphasis Type="Italic">Hinode</Emphasis> |
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| Authors: | D Wang M Zhang H Li H Q Zhang |
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| Institution: | 1.Key Laboratory of Solar Activity, National Astronomical Observatory,Chinese Academy of Sciences,Beijing,China;2.Purple Mountain Astronomical Observatory,Chinese Academy of Sciences,Nanjing,China |
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| Abstract: | We compared a set of cotemporal magnetograms of active regions obtained with the Michelson Doppler Imager (MDI) aboard SOHO
and the Spectro-Polarimeter (SP) of the Solar Optical Telescope (SOT) on board Hinode. The comparison shows that even with the recent calibration of level-1.8 data, the magnetic flux density derived from the
MDI data is still lower than that obtained with SP. The average ratio between current version 2008 MDI level-1.8 data and
SP magnetograms is 0.71, and is 0.82 for version 2007 MDI level-1.8 data. The comparison also shows that the most recent version
2008 calibration of MDI level-1.8 data has successfully removed the center-to-limb variation, while version 2007 level-1.8
data did not, as estimated by Ulrich et al. (Solar Phys.
255, 53, 2009). |
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