Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp41b..07r&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP41B-07
Other
7507 Chromosphere, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835), 7529 Photosphere
Scientific paper
Observations of Evershed flows with the Solar Optical Telescope (SOT) on Hinode (Ichimito, Shine, Lites, et al. 2008, PASJ, 59, S593) showed that penumbral flows have small scale structures and much more complex properties than those of a simple outflow of material with unique direction and appearence. We address this problem and show that the flow properties are directly connected to the observed properties of penumbral filaments and are an integral part of penumbral development during sunspot formation. In our recent model (Ryutova, Berger, & Title, 2008, ApJ, 676, April), based on the observations that sunspot has a filamentary structure and consists of a dense conglomerate of non-collinear interlaced flux tubes, the penumbra is formed due to an on-going reconnection processes that leads to branching out of the peripheral flux tubes from the "trunk". As flux tubes have different parameters, branching occurs at different heights and with different inclinations, thus forming an "uncombed" penumbra. Each elemental act of reconnection generates an inevitable twist in the post-reconnection filaments that acquire a screw pinch configuration. This explains the remarkable dynamic stability of penumbral filaments and their observed properties, such as presence of dark cores, wrapping and spinning of filaments around each other, bright footpoints, etc. Here we show that propagation of twist along current carrying helical flux tubes is accompanied by plasma flows that may have diverse properties depending on the location of interacting flux tubes, their inclination and pitch. We apply the model to observations taken with the SOT instrument, which includes spectro-polarimetric data, and perform quantitative analysis.
Berger Thierry
Frank Zoe
Lites Bruce
Ryutova Margarita
Title Alan
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