Characteristics of the photospheric magnetic field associated with solar flare initiation

摘要: The physical environment governing the solar flare initiation is not fully understood, although there are significant efforts to address relationship between magnetic non-potential parameters and early signatures. In this study, we attempt characterize based on processed Helioseismic Magnetic Imager vector magnetograms, Atmospheric Imaging Assembly 1600 A, RHESSI hard X-ray observations. Three events, M6.6 2011 February 13, X2.2 15, X2.1 September 6, in two active regions AR 11158 11283 investigated. We analyze source field strength photosphere, which defined as magnitude of observed deviation from potential field. It found that one strong above polarity inversion line well connects initial bright kernels conjugate ribbons. results imply distribution photospheric can be used locate site flaring loops regardless configuration pre-flare fields or evolution regions. Moreover, tends become more inclined after flares, consistent with coronal implosion scenario. also employ a fast method derive total current density magnetogram framework force-free This provide estimation within reasonable accuracy without appealing for accurate calculation model extrapolation.