Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp23a..01i&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP23A-01
Physics
7507 Chromosphere, 7524 Magnetic Fields, 7529 Photosphere
Scientific paper
Hinode discovered granular-sized "transient horizontal magnetic fields" (THMFs) on the photosphere. They are ubiquitous in a plage region as well as in the quiet Sun, and they attract a lot of attention due to their apparent unique properties. Spectro-polarimetric observations with the Solar Optical Telescope (SOT) are analyzed to compare the properties of THMFs in both plage and quiet Sun regions near solar disc center. The distribution of magnetic field strengths inferred from Milne-Eddington inversions of the data are remarkably similar. A majority of the THMFs have field strengths smaller than the equipartition field strength for average local convective flow. The occurrence rate in plage is only two times that in the quiet Sun, while the vertical magnetic flux in the plage region is 8 times larger than in the quiet Sun. The similarity in the field strength distributions and the occurrence rates suggests that a common local dynamo process generates THMFs all over the sun. THMFs in the plage region selected for their higher degree of linear polarization appear to have preferred direction which is consistent with that of the plage-region's large-scale vertical field pattern. This fact and the slightly higher occurrence rate in the plage suggest that the THMFs are influenced by the larger-scale magnetic field pattern of the plage. These unique properties of the horizontal magnetic fields are presented. We also plan to clarify a connection between the horizontal magnetic fields and chromospheric activities.
Ishikawa Ryohko
Tsuneta Saku
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