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| Paper: |
Signatures of Moving Magnetic Features in and above the Photosphere |
| Volume: |
454, The 3rd Hinode Science Meeting |
| Page: |
181 |
| Authors: |
Hagenaar, H.; Shine, R.; Ryutova, M.; Sainz Dalda, A. |
| Abstract: |
Hinode/SOT observations of NOAA AR 10933 from 2007 Jan 4 16:14 UT -
Jan 6 22:20 UT are used to study MMFs (moving magnetic features) in
the periphery of the region's large sunspot and the surrounding
moat. The data consist of a nearly continuous set of Fe 6302
Å Stokes V images with sets of G band and Ca II H filtergrams at
various cadences, FOV's, and resolutions plus some SpectroPolarimeter
(SP) scans. We also used TRACE images in 171 Å to follow any
possible signatures at higher temperatures. We applied
automatic object recognition and tracking to the MMFs as seen in the
Fe 6302 Å Stokes V images. An SP scan was used to determine the
line profiles for several paths. Reliable inversions have not yet been
done, but we find a few locations of possible supersonic downflows
from the Stokes IQUV line profiles. The population of MMFs on the East
side of the sunspot is much higher than on the opposite side, mostly
involving a large number of mixed polarity MMFs. Consequently, the
chromosphere shows strongly enhanced brightenings with a clear
pattern: enhanced brightenings in Ca H outline the locations where
opposite polarity MMFs meet.
This activity does not prevent formation of active low lying “closed” loops at coronal temperatures seen in the TRACE 171 Å line.
The other side, with fewer MMFs, shows a pattern that we
found earlier: regions with an MMF deficiency show long living “open”
coronal loops.
This work was supported by NASA contract NNM07AA01C. |
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