Sources and Sinks of the Evershed Flow

Details Sources and Sinks of the Evershed Flow Sources and Sinks of the Evershed Flow

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp31a..01s&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP31A-01

Physics

7524 Magnetic Fields, 7529 Photosphere

Scientific paper

Extending the work of Ichimoto et al (2007), we investigate the sources and sinks of the Evershed flow in sunspot penumbra using data from the Solar Optical Telescope (SOT) instruments on the Hinode satellite. We use spectral maps taken with the Spectro-Polarimeter (SP) that provide detailed snapshots of the large sunspot in AR 10930 over a range of viewing angles as it rotated across the solar disk in December 2006. These are supplemented by images taken with the Filtergraph (FG) instrument that show the dynamics of the structures. AR 10930 has some large sunspots showing sources and sinks within the penumbra as well as near the inner and outer boundaries. There are also regions of contact between penumbra of two sunspots (of opposite magnetic polarity) that show stronger horizontal flows and downdrafts than seen elsewhere in the penumbras. The relationship between Evershed "clouds" showing quasi-periodic variations in the spatially averaged Evershed flow and the penumbral fine structures is also investigated. This work was supported by NASA contract NNM07AA01C.

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