Gyrosynchrotron Emission from Anisotropic Pitch-Angle Distribution of Electrons in 3-D Solar Flare Sources

Autor(es)

Simoes, P. J. A. ^[1] ; Costa, J. E. R. ^[2]

Afiliação do(s) autor(es)

^[1] CRAAM, BR-01302907 Sao Paulo - Brazil

^[2] Inst Nacl Pesquisas Espaciais, BR-12227010 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SOLAR PHYSICS; v. 266, n. 1, p. 109-121, SEP 2010.
• Citações Web of Science: 12

Resumo

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. (AU)

• Processo FAPESP: 04/14248-5 - Distribuição espacial dinâmica de elétrons em explosões solares
• Beneficiário: Paulo José de Aguiar Simões
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 03/03406-6 - Radiação girossincrotrônica de explosões solares em ambientes complexos de campos magnéticos
• Beneficiário: Paulo José de Aguiar Simões
• Modalidade de apoio: Bolsas no Brasil - Mestrado