Sub-THz and Hα activity during the preflare and main phases of a GOES class M2 event

dc.contributor.authorKaufmann P.
dc.contributor.authorMarcon R.
dc.contributor.authorGimenez De Castro C.G.
dc.contributor.authorWhite S.M.
dc.contributor.authorRaulin J.-P.
dc.contributor.authorCorreia E.
dc.contributor.authorFernandes L.O.
dc.contributor.authorDe Souza R.V.
dc.contributor.authorGodoy R.
dc.contributor.authorMarun A.
dc.contributor.authorPereyra P.
dc.description.abstractRadio and optical observations of the evolution of flare-associated phenomena have shown an initial and rapid burst at 0.4THz only followed subsequently by a localized chromospheric heating producing an Hα brightening with later heating of the whole active region. A major instability occurred several minutes later producing one impulsive burst at microwaves only, associated with an M2.0 GOES X-ray flare that exhibited the main Hα brightening at the same site as the first flash. The possible association between long-enduring time profiles at soft X-rays, microwaves, Hα, and sub-THz wavelengths is discussed. In the decay phase, the Hα movie shows a disrupting magnetic arch structure ejecting dark, presumably chromospheric, material upward. The time sequence of events suggests genuine interdependent and possibly non-thermal instabilities triggering phenomena, with concurrent active region plasma heating and material ejection. © 2011. The American Astronomical Society. All rights reserved.
dc.relation.ispartofAstrophysical Journal
dc.rightsAcesso Aberto
dc.subject.otherlanguageSun: activity
dc.subject.otherlanguageSun: flares
dc.subject.otherlanguageSun: radio radiation
dc.subject.otherlanguageSun: X-rays, gamma rays
dc.titleSub-THz and Hα activity during the preflare and main phases of a GOES class M2 event