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Plasma heating in the very early phase of solar flares View all abstracts by submitter

Robert Falewicz   Submitted: 2009-10-05 06:21

In this paper we analyze soft and hard X-ray emission of the 2002 September 20 M1.8 GOES class solar flare observed by RHESSI and GOES satellites. In this flare event, soft X-ray emission precedes the onset of the main bulk hard X-ray emission by ~5 min. This suggests that an additional heating mechanism may be at work at the early beginning of the flare. However RHESSI spectra indicate presence of the non-thermal electrons also before impulsive phase. So, we assumed that a dominant energy transport mechanism during rise phase of solar flares is electron beam-driven evaporation. We used non-thermal electron beams derived from RHESSI spectra as the heating source in a hydrodynamic model of the analyzed flare. We showed that energy delivered by non-thermal electron beams is sufficient to heat the flare loop to temperatures in which it emits soft X-ray closely following the GOES 1-8A light-curve. We also analyze the number of non-thermal electrons, the low energy cut-off, electron spectral indices and the changes of these parameters with time.

Authors: M. Siarkowski, R. Falewicz, and P. Rudawy
Projects: RHESSI

Publication Status: accepted (ApJL)
Last Modified: 2009-10-05 09:41
Go to main E-Print page  Observations of quasi-periodic solar X-ray emission as a result of MHD oscillations in a system of multiple flare loops  Numerical simulation of the internal plasma dynamics of post-flare loops  Edit Entry  Download Preprint  Delete Entry 

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