3D magnetic field structure and its relations with the flares in active region NOAA8100 Original Research Article

With the photospheric magnetograms, Hα, Hβ filtergrams, and Yohkoh/SXT data, we study an emerging flux region (EFR) and its associated flare activity in detail. This EFR appearred on 03 November 1997 in the active region NOAA8100 and was responsible for at least 3 M-class flares and 19 C-class and micro- flares. Overall magnetic structure in this region changed after emergence of this magnetic feature, and potential-like structure around the EFR site became highly sheared. Our research indicates that the EFR not only triggers flares but also, as an essential process and a major role in the following flare activity, enhances the degree of magnetic non-potentiality and builds up flare energy and flare-producing environment.