Submillimeter Radiation as the Thermal Component of the Neupert Effect

Página do item simplificado
dc.contributor.authorValle Silva J.F.
dc.contributor.authorGimenez de Castro C.G.
dc.contributor.authorSimoes P.J.A.
dc.contributor.authorRaulin J.-P.
dc.date.accessioned2024-03-12T23:51:42Z
dc.date.available2024-03-12T23:51:42Z
dc.date.issued2019
dc.description.abstract© 2019, Springer Nature B.V.The Neupert effect is the empirical observation that the temporal evolution of non-thermal emission (e.g. hard X-rays) is frequently proportional to the temporal derivative of the thermal emission flux (soft X-rays), or vice versa, that time-integrated non-thermal flux is proportional to thermal flux. We analyzed the GOES M2.2 event SOL2011-02-14T17:25, and we found that the 212 GHz emission plays quite well the role of the thermal component of the Neupert effect. We show that the maximum of the hard X-ray flux for energies above 50 keV is coincident in time with the temporal derivative of the 212 GHz flux, within the uncertainties. The microwave flux density at 15.4 GHz, produced by optically thin gyrosynchrotron mechanism, and hard-X rays above 25 keV mark the typical impulsive phase, and they have similar temporal evolution. On the other hand, the 212 GHz emission is delayed by about 25 seconds with respect to the microwave and hard X-ray peak. We argue that this delay cannot be explained by magnetic trapping of non-thermal electrons. With all of the observational evidence, we suggest that the 212 GHz emission is produced by thermal bremsstrahlung, initially in the chromosphere, and shifting to optically thin emission from the hot coronal loops at the end of the gradual phase.
dc.description.issuenumber11
dc.description.volume294
dc.identifier.doi10.1007/s11207-019-1542-3
dc.identifier.issn0038-0938
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35189
dc.relation.ispartofSolar Physics
dc.rightsAcesso Restrito
dc.subject.otherlanguageChromospheric evaporation
dc.subject.otherlanguageFlares submillimeter radiation
dc.subject.otherlanguageFlares, dynamics
dc.subject.otherlanguageFlares, X-rays
dc.titleSubmillimeter Radiation as the Thermal Component of the Neupert Effect
dc.typeArtigo
local.scopus.citations3
local.scopus.eid2-s2.0-85074283893
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85074283893&origin=inward
Arquivos
Coleções
Artigos de periódico