Gyrosynchrotron Emission from Anisotropic Pitch-Angle Distribution of Electrons in 3-D Solar Flare Sources |
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| Authors: | P J A Simões J E R Costa |
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| Institution: | 1.Centro de Rádio Astronomia e Astrofísica Mackenzie – CRAAM,S?o Paulo,Brazil;2.Instituto Nacional de Pesquisas Espaciais – INPE,S?o José dos Campos,Brazil |
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| Abstract: | We present calculations, made for the first time, of the gyrosynchrotron emission by mildly relativistic electrons with anisotropic
pitch-angle distribution using a realistic magnetic loop model in three dimensions. We investigated the intensity, spectral
index of the optically thin region of the spectrum, the spatial morphology and the dependency on the source position on the
solar disk. The method to describe a three-dimensional source and the procedure to perform the calculations are presented.
We have modified the Ramaty’s gyrosynchrotron code to allow the evaluation of anisotropic pitch-angle electron distributions,
as described in the complete formalism. We found that anisotropic electron distributions affect the intensity of the radiation,
spatial morphology and spectrum of spatially resolved sources. However, the spatially integrated spectrum of the emission
seems to be insensitive to the electron pitch-angle distribution, as the magnetic field inhomogeneity smooths out the effects
of the anisotropic distribution in the produced radiation, in contrast to homogeneous sources. |
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