Origin of the Submillimeter Radio Emission During the Time-Extended Phase of a Solar Flare

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dc.contributor.authorTrottet G.
dc.contributor.authorRaulin J.-P.
dc.contributor.authorGimenez de Castro G.
dc.contributor.authorLuthi T.
dc.contributor.authorCaspi A.
dc.contributor.authorMandrini C.H.
dc.contributor.authorLuoni M.L.
dc.contributor.authorKaufmann P.
dc.date.accessioned2024-03-13T01:10:15Z
dc.date.available2024-03-13T01:10:15Z
dc.date.issued2011
dc.description.abstractSolar flares observed in the 200-400 GHz radio domain may exhibit a slowly varying and time-extended component which follows a short (few minutes) impulsive phase and can last for a few tens of minutes to more than one hour. The few examples discussed in the literature indicate that such long-lasting submillimeter emission is most likely thermal bremsstrahlung. We present a detailed analysis of the time-extended phase of the 27 October 2003 (M6.7) flare, combining 1-345 GHz total-flux radio measurements with X-ray, EUV, and Hα observations. We find that the time-extended radio emission is, as expected, radiated by thermal bremsstrahlung. Up to 230 GHz, it is entirely produced in the corona by hot and cool materials at 7-16 MK and 1-3 MK, respectively. At 345 GHz, there is an additional contribution from chromospheric material at a few 104 K. These results, which may also apply to other millimeter-submillimeter radio events, are not consistent with the expectations from standard semiempirical models of the chromosphere and transition region during flares, which predict observable radio emission from the chromosphere at all frequencies where the corona is transparent. © 2011 Springer Science+Business Media B.V.
dc.description.firstpage339
dc.description.issuenumber2
dc.description.lastpage361
dc.description.volume273
dc.identifier.doi10.1007/s11207-011-9875-6
dc.identifier.issn0038-0938
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/36931
dc.relation.ispartofSolar Physics
dc.rightsAcesso Restrito
dc.subject.otherlanguageChromosphere, active
dc.subject.otherlanguageFlares, relation to magnetic field
dc.subject.otherlanguageRadio bursts, association with flares
dc.subject.otherlanguageRadio bursts, microwave
dc.subject.otherlanguageX-ray bursts, association with flares
dc.titleOrigin of the Submillimeter Radio Emission During the Time-Extended Phase of a Solar Flare
dc.typeArtigo
local.scopus.citations22
local.scopus.eid2-s2.0-81155131174
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=81155131174&origin=inward
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