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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Thyr: a volumetric ray-marching tool for simulating microwave emission

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Autor(es):
Osborne, Christopher M. J. [1] ; Simoes, Paulo J. A. [2, 3, 1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark - Scotland
[2] Univ Presbiteriana Mackenzie, Escola Engn, BR-01302907 Sao Paulo, SP - Brazil
[3] Univ Presbiteriana Mackenzie, CRAAM, BR-01302907 Sao Paulo, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 485, n. 3, p. 3386-3397, MAY 2019.
Citações Web of Science: 0
Resumo

Gyrosynchrotron radiation is produced by solar flares, and can be used to infer properties of the accelerated electrons and magnetic field of the flaring region. This microwave emission is highly dependent on many local plasma parameters, and the viewing angle. To correctly interpret observations, detailed simulations of the emission are required. Additionally, gyrosynchrotron emission from the chromosphere has been largely ignored in modelling efforts, and recent studies have shown the importance of thermal emission at millimetric wavelengths. Thyr is a new tool for modelling microwave emission from three-dimensional flaring loops with spatially varying atmosphere and increased resolution in the lower corona and chromosphere. Thyr is modular and open-source, consisting of separate components to compute the thermal and non-thermal microwave emission coefficients and perform three-dimensional radiative transfer (in local thermodynamic equilibrium). The radiative transfer integral is computed by a novel ray-marching technique to efficiently compute the contribution of many volume elements. This technique can also be employed on a variety of astrophysics problems. Herein we present a review of the theory of gyrosynchrotron radiation, and two simulations of identical flare loops in low-and high resolution performed with Thyr, with a spectral imaging analysis of differing regions. The high-resolution simulation presents a spectral hardening at higher frequencies. This hardening originates around the top of the chromosphere due to the strong convergence of the magnetic field, and is not present in previous models due to insufficient resolution. This hardening could be observed with a coordinated flare observation from active radio observatories. (AU)

Processo FAPESP: 08/09339-2 - Análise da evolução temporal da emissão rádio durante explosões solares em ambientes não-homogêneos
Beneficiário:Paulo José de Aguiar Simões
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 09/18386-7 - Modelagem integrada de emissões em rádio e raios-X durante explosões solares
Beneficiário:Carlos Guillermo Giménez de Castro
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 03/03406-6 - Radiação girossincrotrônica de explosões solares em ambientes complexos de campos magnéticos
Beneficiário:Paulo José de Aguiar Simões
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 04/14248-5 - Distribuição espacial dinâmica de elétrons em explosões solares
Beneficiário:Paulo José de Aguiar Simões
Linha de fomento: Bolsas no Brasil - Doutorado