Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp31b..01k&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP31B-01
Other
7524 Magnetic Fields, 7529 Photosphere
Scientific paper
Continuous observations of sunspot penumbrae with the Solar Optical Telescope aboard Hinode clearly show that the outer boundary of the penumbra fluctuates around its averaged position. The penumbral outer boundary moves inward when granules appear in the outer penumbra. We discover that such granules appear one after another while moving magnetic features (MMFs) are separating from the penumbral "spines" (penumbral features having fields that are stronger and more vertical than their surroundings). These granules that appear in the outer penumbra often merge with bright features inside the penumbra that move with spines as they elongate toward the moat region. This suggests that convective motions around the penumbral outer boundary are related to disintegration of magnetic flux in the sunspot. We also find that dark penumbral filaments frequently elongate into the moat region in the vicinity of MMFs that detach from penumbral spines. Such elongating dark penumbral filaments correspond to nearly horizontal fields extending from the penumbra. Pairs of MMFs with positive and negative polarities are sometimes observed along the elongating dark penumbral filaments. This strongly supports the notion that such elongating dark penumbral filaments have magnetic fields with a "sea serpent"-like structure. Evershed flows, which are associated with the penumbral horizontal fields, may be related to detachment of the MMFs from the penumbral spines, as well as to the formation of the MMFs along the dark penumbral filaments that elongate into the moat region.
Ichimoto Kiyoshi
Katsukawa Yukio
Kubo Masahito
Lites Bruce W.
Nagata Shin'ichi
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