Spectral signature of solar active region in millimetre and submillimetre wavelengths

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dc.contributor.authorValle Silva J.F.
dc.contributor.authorGimenez De Castro C.G.
dc.contributor.authorSelhorst C.L.
dc.contributor.authorRaulin J.-P.
dc.contributor.authorValio A.
dc.date.accessioned2024-03-12T23:49:23Z
dc.date.available2024-03-12T23:49:23Z
dc.date.issued2020
dc.description.abstract© 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.
dc.description.firstpage1964
dc.description.issuenumber2
dc.description.lastpage1969
dc.description.volume500
dc.identifier.doi10.1093/mnras/staa3354
dc.identifier.issn1365-2966
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35059
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsAcesso Aberto
dc.subject.otherlanguagemethods: observational
dc.subject.otherlanguageSun: chromosphere
dc.subject.otherlanguageSun: faculae, plages
dc.subject.otherlanguageSun: radio radiation
dc.subject.otherlanguagesunspots
dc.titleSpectral signature of solar active region in millimetre and submillimetre wavelengths
dc.typeArtigo
local.scopus.citations5
local.scopus.eid2-s2.0-85097507369
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85097507369&origin=inward
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