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Analysis of magnetic shear in an X17 solar flare on October 28, 2003 View all abstracts by submitter

Yingna Su   Submitted: 2007-01-11 10:44

An X17 class (GOES soft X-ray) two-ribbon solar flare on 2003 October 28 is analyzed in order to determine the relationship between the timing of the impulsive phase of the flare and the magnetic shear change in the flaring region. EUV observations made by the Transition Region and Coronal Explorer (TRACE) show a clear decrease in the shear of the flare footpoints during the flare. The shear change stopped in the middle of the impulsive phase. The observations are interpreted in terms of the splitting of the sheared envelope field of the greatly sheared core rope during the early phase of the flare. We have also investigated the temporal correlation between the EUV emission from the brightenings observed by TRACE and the hard X-ray (HXR) emission (E > 150 keV) observed by the anticoincidence system (ACS) of the spectrometer SPI on board the ESA INTEGRAL satellite. The correlation between these two emissions is very good, and the HXR sources (RHESSI) late in the flare are located within the two EUV ribbons. These observations are favorable to the explanation that the EUV brightenings mainly result from direct bombardment of the atmosphere by the energetic particles accelerated at the reconnection site, as does the HXR emission. However, if there is a high temperature (T > 20 MK) HXR source close to the loop top, a contribution of thermal conduction to the EUV brightenings cannot be ruled out.

Authors: Y.N. Su, L. Golub, A.A. Van Ballegooijen, M. Gros
Projects: TRACE

Publication Status: Solar Physics, 2006, Vol 236, 325-349
Last Modified: 2007-01-11 11:56
Go to main E-Print page  Transition Region Emission and Energy Input to Thermal Plasma During the Impulsive Phase of Solar Flares  Energetics of Solar Coronal Mass Ejections  Edit Entry  Download Preprint  Delete Entry 

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