Simultaneous microwave and X-ray emission from accelerated electrons in solar flares

Details Simultaneous microwave and X-ray emission from accelerated electrons in solar flares Simultaneous microwave and X-ray emission from accelerated electrons in solar flares

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.50k&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

Accelerated particles play a key role in development of solar flares. Hard X-rays (produced due to thick-target bremsstrahlung) and microwave emission (produced due to incoherent gyrosynchrotron radiation) are the direct observable manifestations of non-thermal electrons. We analyze the microwave and X-ray emission produced by the same anisotropic population of accelerated electrons precipitating from a loop top into footpoints. The distribution function of precipitating electrons is obtained by solving Fokker-Planck equation with pitch-angle diffusion including energy losses in collisions, self-induced electric field and inhomogeneous magnetic field. The parameters of plasma are calculated by using hydrodynamic simulation of plasma heating by an electron beam. The emission and polarization in hard X-rays and microwaves produced by beam electrons with different parameters at different times are calculated. The anisotropy of energetic electrons and effective depths of formation are found to strongly affect the resulting photon spectra from a flaring atmosphere and the beam parameters deduced from microwave and X-ray observations. The simulation results are fit very well to the simultaneous observations by RHESSI payload and Nobeyama radioheliograph obtained for a few flares.

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