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Temporal Evolution of Free Magnetic Energy Associated with Four X-class Flares View all abstracts by submitter

Ju Jing   Submitted: 2009-02-23 07:06

We study the temporal variation of free magnetic energy Efree around the time of four X-class flares. The high-cadence photospheric vector magnetograms obtained by the digital vector magnegograph (DVMG) system at the Big Bear Solar Observatory (BBSO) are used as the boundary conditions to reconstruct the three-dimensional (3D) non-linear force-free (NLFF) coronal field. In order to remove the effect of the net Lorentz force and torque acting in the photosphere, the vector magnetograms are preprocessed using the method devised by Wiegelmann et al. (2006). Then a well-tested multigrid-like optimization code by Wiegelmann (2004) is applied to the preprocessed boundary data to extrapolate the NLFF coronal field with which we are able to estimate the free energy Efree. In all the four events, we find a significant drop of Efree starting sim15 min before the peak time of the associated non-thermal flare emission, although long term trend varies from event to event. We discuss the physical implication of the result, i.e., the magnetic relaxation is already going on in the corona well before the flare reconnection.

Authors: Ju Jing, P. F. Chen, Thomas Wiegelmann, Yan Xu, Sung-Hong Park, Haimin Wang

Publication Status: accepted by Ap.J.
Last Modified: 2010-07-12 08:48
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