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Abstract: In this paper we analyze soft and hard X-ray emission of the 2002 September20 M1.8 GOES class solar flare observed by RHESSI and GOES satellites. In thisflare event, soft X-ray emission precedes the onset of the main bulk hard X-rayemission by ~5 min. This suggests that an additional heating mechanism may beat work at the early beginning of the flare. However RHESSI spectra indicatepresence of the non-thermal electrons also before impulsive phase. So, weassumed that a dominant energy transport mechanism during rise phase of solarflares is electron beam-driven evaporation. We used non-thermal electron beamsderived from RHESSI spectra as the heating source in a hydrodynamic model ofthe analyzed flare. We showed that energy delivered by non-thermal electronbeams is sufficient to heat the flare loop to temperatures in which it emitssoft X-ray closely following the GOES 1-8 A light-curve. We also analyze thenumber of non-thermal electrons, the low energy cut-off, electron spectralindices and the changes of these parameters with time.



Autor: M. Siarkowski, R. Falewicz, P. Rudawy

Fuente: https://arxiv.org/







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