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First Flare-related Rapid Change of Photospheric Magnetic Field Observed by Solar Dynamics Observatory by Wang, Shuo; Liu, Chang; Liu, Rui; Deng, Na; Liu, Yang; Wang, Haimin is a scholarly article available to read on EtoBox.

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Photospheric magnetic field not only plays important roles in building up free energy and triggering solar eruptions, but also has been observed to change rapidly and permanently responding to the coronal magnetic field restructuring due to coronal transients. The Helioseismic and Magnetic Imager instrument (HMI) on board the newly launched Solar Dynamics Observatory (SDO) produces seeing-free full-disk vector magnetograms at consistently high resolution and high cadence, which finally makes possible an unambiguous and comprehensive study of this important back-reaction process. In this study, we present a near disk-center, GOES-class X2.2 flare occurred at NOAA AR 11158 on 2011 February 15 using the magnetic field measurements made by HMI. We obtained the first solid evidence of an enhancement in the transverse magnetic field at the flaring magnetic polarity inversion line (PIL) by a magnitude of 70%. This rapid and irreversible field evolution is unequivocally associated with the flare occurrence, with the enhancement area located in between the two chromospheric flare ribbons. Similar findings have been made for another two major flare events observed by SDO. These results stron

Author

Wang, Shuo; Liu, Chang; Liu, Rui; Deng, Na; Liu, Yang; Wang, Haimin

Published

2011

Language

EN