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Diagnostics of electron beam properties from the simultaneous hard X-ray and microwave emission in the 10 March 2001 flare | | V.V. Zharkova
; N.S. Meshalkina
; L.K. Kashapova
; A.A. Kuznetsov
; A.T. Altyntsev
; | | Date: |
18 May 2011 | | Abstract: | Simultaneous simulation of HXR and MW emission with the same populations of
electrons is still a great challenge for interpretation of observations in real
events. In this paper we apply the FP kinetic model of precipitation of
electron beam with energy range from 12 keV to 1.2 MeV to the interpretation of
X-ray and microwave emissions observed in the flare of 10 March 2001. Methods.
The theoretical HXR and MW emissions were calculated by using the distribution
functions of electron beams found by solving time-dependent Fokker-Planck
approach in a converging magnetic field (Zharkova at al., 2010; Kuznetsov and
Zharkova, 2010) for anisotropic scattering of beam electrons on the ambient
particles in Coloumb collisions and Ohmic losses. The simultaneous observed HXR
photon spectra and frequency distribution of MW emission and polarization were
fit by those simulated from FP models which include the effects of electric
field induced by beam electrons and precipitation into a converging magnetic
loop. Magnetic field strengths in the footpoints on the photosphere were
updated with newly calibrated SOHO/MDI data. The observed HXR energy spectrum
above 10 keV is shown to be a double power law which was fit precisely by the
photon HXR spectrum simulated for the model including the self-induced electric
field but without magnetic convergence. The MW emission simulated for different
models of electron precipitation revealed a better fit to the observed
distribution at higher frequencies for the models combining collisions and
electric field effects with a moderate magnetic field convergence of 2. The MW
simulations were able to reproduce closely the main features of the MW emission
observed at higher frequencies. | | Source: | arXiv, 1105.3508 | | Services: | Forum | Review | PDF | Favorites | |
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