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Diagnostics of electron beam properties from the simultaneous hard X-ray and microwave emission in the 10 March 2001 flare View all abstracts by submitter

Valentina Zharkova   Submitted: 2011-05-23 08:56

Simultaneous simulation of HXR and MW emission with the same populations ofelectrons is still a great challenge for interpretation of observations in realevents. In this paper we apply the FP kinetic model of precipitation ofelectron beam with energy range from 12 keV to 1.2 MeV to the interpretation ofX-ray and microwave emissions observed in the flare of 10 March 2001. Methods.The theoretical HXR and MW emissions were calculated by using the distributionfunctions of electron beams found by solving time-dependent Fokker-Planckapproach in a converging magnetic field (Zharkova at al., 2010; Kuznetsov andZharkova, 2010) for anisotropic scattering of beam electrons on the ambientparticles in Coloumb collisions and Ohmic losses. The simultaneous observed HXRphoton spectra and frequency distribution of MW emission and polarization werefit by those simulated from FP models which include the effects of electricfield induced by beam electrons and precipitation into a converging magneticloop. Magnetic field strengths in the footpoints on the photosphere wereupdated with newly calibrated SOHO/MDI data. The observed HXR energy spectrumabove 10 keV is shown to be a double power law which was fit precisely by thephoton HXR spectrum simulated for the model including the self-induced electricfield but without magnetic convergence. The MW emission simulated for differentmodels of electron precipitation revealed a better fit to the observeddistribution at higher frequencies for the models combining collisions andelectric field effects with a moderate magnetic field convergence of 2. The MWsimulations were able to reproduce closely the main features of the MW emissionobserved at higher frequencies.

Authors: Zharkova, V.V., Meshalkina, N.S., Kashapova, L.K., Kuznetsov, A.A. and Altyntsev A.T.
Projects: RHESSI

Publication Status: Astronomy and Astrophysics, in press
Last Modified: 2011-05-24 09:44
Go to main E-Print page  Radio emission of the Quiet Sun and Active Regions (Invited review)  Successive merging of plasmoids and fragmentation in a flare current sheet and their X-ray and radio signatures  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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