AAS 200th meeting, Albuquerque, NM, June 2002
Session 38. Solar Photosphere, Chromosphere and Transition Region
Display, Tuesday, June 4, 2002, 10:00am-6:30pm, SW Exhibit Hall

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[38.03] Evolution of Filamentary Structures in and around a Large Solar Pore

G. W. Simon (Emeritus Research Services, AFRL,NSO), I. Dorotovic (Slovak Central Observatory, Hurbanovo), M. Sobotka (Czech Astronomical Institute, Ondrejov), P.N. Brandt (Kiepenheuer Institut, Freiburg)

We have studied evolution of a filamentary region attached to a pore, horizontal motions around the pore, and small-scale morphological changes, using an 11-hour series of 1782 high resolution white-light images of a large pore in the sunspot group NOAA 7519, acquired on 5 June 1993 at the Swedish Vacuum Solar Telescope, La Palma, Canary Islands. We find that the structure of the region between the large pore and an adjacent micropore was not always filamentary, but varied back and forth in time between a filamentary structure and a granular one. A clockwise rotation, at times exceeding 7 deg/h, of this filamentary region around the center of the pore, was observed during the whole run. Motions of fine structure around and within the pore were studied in detail using local correlation and feature tracking. We conclude that the filamentary region, while it had some typical penumbral characteristics, was different from a normal penumbra. This research has been funded by the USAF Research Lab, and by Emeritus Research Services.

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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.