Hard X-Ray Footpoint Convergence and Photospheric Field Change

Details Hard X-Ray Footpoint Convergence and Photospheric Field Change Hard X-Ray Footpoint Convergence and Photospheric Field Change

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2234l&link_type=abstract

American Astronomical Society, SPD meeting #42, #22.34; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We study the GOES-class X2.2 flare occurred at NOAA AR 11158 on 2011 February 15. An enhancement of transverse magnetic field by as much as 70% is observed by SDO/HMI at the flaring magnetic polarity inversion line (PIL). This rapid and irreversible field evolution occurs in between the hard X-ray (HXR) footpoints as observed by RHESSI, and is temporally associated with a jump of the conjugate footpoints from a highly sheared, widely separated configuration to a less sheared, less separated configuration. The dynamics is consistent with the tether-cutting model, in which the less sheared overlying field is stretched by the newly reconnected, highly sheared field and consequently reconnect below the highly sheared field. The enhancement of transverse field could be due to tether-cutting reconnection which occurs in the low atmosphere.

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