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Na Deng   Submitted: 2011-05-10 12:41

We present G-band and Ca II H observations of NOAA AR 10930 obtained by Hinode/SOT on 2006 December 6 covering an X6.5 flare. The Local Correlation Tracking technique was applied to the foreshortening-corrected G-band image series to acquire horizontal proper motions in this complex ??? active region. With the continuous high-quality, spatial and temporal resolution G-band data, we not only confirm the rapid decay of outer penumbrae and darkening of the central structure near the flaring neutral line, but also unambiguously detect for the first time the enhancement of the sheared Evershed flow (average horizontal flow speed increased from 330 ± 3.1 to 403 ± 4.6 m s–1) along the neutral line right after the eruptive white-light flare. Post-flare Ca II H images indicate that the originally fanning out field lines at the two sides of the neutral line get connected. Since penumbral structure and Evershed flow are closely related to photospheric magnetic inclination or horizontal field strength, we interpret the rapid changes of sunspot structure and surface flow as the result of flare-induced magnetic restructuring down to the photosphere. The magnetic fields turn from fanning out to inward connection causing outer penumbrae decay, meanwhile those near the flaring neutral line become more horizontal leading to stronger Evershed flow there. The inferred enhancement of horizontal magnetic field near the neutral line is consistent with recent magnetic observations and theoretical predictions of flare-invoked photospheric magnetic field change.

Authors: Na Deng, Chang Liu, Debi Prasad Choudhary and Haimin Wang
Projects: Hinode/SOT

Publication Status: Published in ApJL
Last Modified: 2011-05-11 09:12
Go to main E-Print page  The Evolution of Sunspot Magnetic Fields Associated with a Solar Flare  Can coronal hole spicules reach coronal temperatures?  Edit Entry  Download Preprint  Delete Entry 

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