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RHESSI Spectral Analysis of the 1N/M1.9 flare of 20 October 2003 View all abstracts by submitter

Hui Li   Submitted: 2004-10-14 17:44

We studied the 1N/M1.9 confined flare of 20 October 2003 observed during a joint observation program (JOP157) with emphasis on the Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) X-ray spectra analysis and synthetic analysis with data from other instruments and in other wavelengths. This flare shows a long impulsive phase and four GOES 1 - 8 A X-ray peaks/plateaus implying multiple magnetic field reconnections during the flare. This results is supported by the change of hard X-ray (HXR) source at different times. Results from the RHESSI spectra analysis reveal that there were super-hot plasma bulks of up to 6.5e7 K during the impulsive phase and HXR emissions of the flare that underwent a `soft - hard - softer - harder - soft' evolution because of the multiple reconnections. Using the fitting parameters of RHESSI spectra analysis and the assumption of a `thin-target' model with a low energy cutoff of 15 keV for the power-law distribution of non-thermal electrons, we calculated the thermal and non-thermal energies stored in the flare, and showed that in most of the impulsive and gradual phase the non-thermal energy represent a small part (<15%) of the total flare energy, suggesting that the HXR emissions are of thermal feature and the energies released during several magnetic field reconnections are transported to the chromosphere mainly by thermal conduction. Factors affecting the energy estimation are discussed.

Authors: Hui Li, Arkadiusz Berlicki, and Brigitte Schmieder
Projects: None

Publication Status: Submitted to A&A
Last Modified: 2004-10-14 17:44
Go to main E-Print page  Survey on solar X-ray flares and associated coherent radio emissions  Distribution of the magnetic flux in elements of the magnetic field in active regions  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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