Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.2002w&link_type=abstract
American Astronomical Society, SPD meeting #37, #20.02; Bulletin of the American Astronomical Society, Vol. 38, p.248
Other
Scientific paper
We study the short-term evolution of magnetic fieldsassociated with five flares in delta sunspots. We concentrate on theanalysis of magnetic gradient along the flaring neutral lines. Rapidchanges of gradient obviously occurred immediately following the onset ofeach flare. Rapid gradient increase was found to be associated with threeevents, while decrease was found for the other two. The changes werepermanent, therefor, not likely due to the effect of flare emissions. Inaddition, we evaluated the overall relative motions between two magneticpolarities in the these delta regions, in the direction parallel andperpendicular to the flaring neutral lines, respectively. Using the methodof Center-of-Mass (CoM) separation calculation, we found that: (1)converging motion corresponded to gradient increase, diverging motion, thedecrease (2) for all the events, there appeared a sudden release ofmagnetic shear associated with each flare, signified by a decrease of CoMseparation between 500 and 1000 km in the direction parallel to theneutral line. Combining the findings presented here with those in previouspapers, such as penumbral decay in the outer boundaries of delta spots,increase of transverse fields at the flaring neutral lines and unbalancedfluxes changes associated with flares, we propose that these are evidencesof quadrupolar magnetic reconnection at or close to the photosphere. Wefurther propose that this is the first stage of the two-stage energyrelease for flares and CMEs.
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