| Texto completo | |
| Autor(es): |
Valio, Adriana
;
da Silva, Douglas F.
;
Li, Hui
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ASTRONOMISCHE NACHRICHTEN; v. N/A, p. 7-pg., 2024-12-22. |
| Resumo | |
For a deeper understanding of the physical processes at play in solar flares, it is necessary to analyze the flare emissions at multiple wavelengths. This multifrequency approach enables the characterization of energetic electrons accelerated from hundreds of keV and up to several tens of MeV. This study reports on the observation of 10 solar flares, in which the spectral parameters were determined for the cm/mm and x-ray bands. The radio spectrum was fitted using gyrosynchrotron emission whereas the hard x-rays fit considered a model of thermal plus nonthermal emission of accelerated electrons. The results show that the spectral indices of the energy distribution of nonthermal electrons emitting in millimeter and hard x-rays do not agree, with the millimeter spectral index being approximately 2 units harder than that of hard x-rays. These findings are consistent with previous research and suggest the existence of a break in the energy spectrum of accelerated electrons. Moreover, for the only flare where photons exceeding 1 MeV were detected, the hard x-ray spectra exhibited a broken power-law where the index of the electron distribution above similar to 500 keV agreed with the inferred radio spectral index. (AU) | |
| Processo FAPESP: | 18/04055-8 - Espectroscopia de alta precisão: das primeiras estrelas aos planetas |
| Beneficiário: | Jorge Luis Melendez Moreno |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 21/02120-0 - Investigação de fenômenos de astrofísica de plasmas e altas energias, instalação do ASTRI-Mini Array & construção dos telescópios de tamanho pequeno do Cherenkov Telescope Array (CTA-SSTs) |
| Beneficiário: | Elisabete Maria de Gouveia Dal Pino |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |