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PRE-FLARE DYNAMICS OF SUNSPOT GROUPS View all abstracts by submitter

Marianna Korsos   Submitted: 2014-06-20 06:03

Several papers provide evidence that the most probable sites of flare onset are the regions of high horizontal magnetic field gradients in solar active regions. Besides the localization of flare-producing areas, this work intends to reveal the characteristic temporal variations in these regions prior to flares. This study uses sunspot data instead of magnetograms and follows the behavior of a suitable defined proxy measure representing the horizontal magnetic field gradient. The source of the data is the SDD (SOHO/MDI-Debrecen Data) sunspot catalog. The most promising pre-flare signatures are the following properties of gradient variation: (1) steep increase, (2) high maximum, (3) significant fluctuation, and (4) a gradual decrease between the maximum and the flare onset that can be related to the "pull mode" of the current layer. These properties may yield a tool for the assessment of flare probability and intensity within the following 8-10 hr.

Authors: M.B.Kors?s,T.Baranyi,A.Ludmány
Projects: SoHO-MDI

Publication Status: article published in Astrophysical Journal
Last Modified: 2014-06-20 06:31
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