On the dynamic activity in sheared corridors of large delta spots

Details On the dynamic activity in sheared corridors of large delta spots On the dynamic activity in sheared corridors of large delta spots

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..143..107t&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 143, no. 1, p. 107-118.

Physics

15

Penumbras, Photosphere, Solar Activity, Sunspots, H Alpha Line, Solar Flares, Solar Flux

Scientific paper

A study of registered, highly time-compressed, white-light movies, made from digital data obtained at Big Bear, revealed dynamic and complex photospheric activity for the first time inside the large delta spot of the March 1989 region. Similar activity in two other regions of large delta spots with sheared penumbral structure was found. They are NOAA Nos. 5629 and 5747 in August and October of 1989, respectively. Both are extraordinarily flare-prolific regions as well. The unusual dynamic activity consists of two parts: the motion of the penumbra and the emergence of new spots in the midst of the penumbral motion. The manner and place of emergence are different from those in ordinary emerging flux regions, and often the spots are without observable opposite polarity flux.

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