Spectral signature of solar active region in millimetre and submillimetre wavelengths

Tipo
Artigo
Data de publicação
2020
Periódico
Monthly Notices of the Royal Astronomical Society
Citações (Scopus)
5
Autores
Valle Silva J.F.
Gimenez De Castro C.G.
Selhorst C.L.
Raulin J.-P.
Valio A.
Orientador
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Programa
Resumo
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.Active regions were observed with different instruments covering the spectral band from 17 to 405 GHz. The observations were made with the Nobeyama Radioheliograph (17 GHz), the Atacama Large Millimetre Array (107 and 238 GHz), and the Solar Submillimeter Telescope (212 and 405 GHz). A procedure was developed that allows the comparison between observations taken with telescopes of different operational characteristics and mainly of different spatial resolution. The brightness temperature and density flux spectra of several active regions corresponding to a different phase of its lifetime were obtained. The flux density invariably increases in all cases from 107 to 405 GHz and the mean spectral index is ∼2 showing that the dominant emission mechanism at submillimeter frequencies is still thermal. We show that Solar Submillimeter Telescope (SST) and Atacama Large Millimeter/submillimeter Array (ALMA) observations are compatible within the uncertainties, a result of great interest for future joint observations.
Descrição
Palavras-chave
Assuntos Scopus
Citação
DOI (Texto completo)