Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp51c..01l&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP51C-01
Physics
7519 Flares, 7524 Magnetic Fields, 7529 Photosphere
Scientific paper
Recent white-light observations demonstrated a consistent pattern of changes in sunspot structures: part of the penumbral segments in the outer δ spot decays rapidly after flares, and meanwhile, the umbral cores and/or inner penumbral regions are enhanced. To explain these observations, Liu et al. (2005) proposed a reconnection picture in which the two components of a δ spot become strongly connected as the result of the flare. With the unprecedented Hinode vector magnetograms, we compare the magnetic inclination angle at peripheral and inner penumbral regions before and after the 4B/X3.4 flare of 2006 December 13. We find that the mean inclination angle at the penumbral decay region increases after the flare while that at the inner penumbral regions decreases. This result agrees with the reconnection picture by Liu et al., i.e., penumbral fields change from a more inclined to a more vertical configuration after the flare, while the umbral core and/or inner penumbral fields change to a more horizontal configuration.
Jing Ji-liang
Li Yadong
Wang Hai-Hong
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