Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/74694
Type: Artigo de periódico
Title: SUB-THz AND H alpha ACTIVITY DURING THE PREFLARE AND MAIN PHASES OF A GOES CLASS M2 EVENT
Author: Kaufmann, P
Marcon, R
de Castro, CGG
White, SM
Raulin, JP
Correia, E
Fernandes, LO
de Souza, RV
Godoy, R
Marun, A
Pereyra, P
Abstract: Radio and optical observations of the evolution of flare-associated phenomena have shown an initial and rapid burst at 0.4 THz only followed subsequently by a localized chromospheric heating producing an Ha 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 Ha brightening at the same site as the first flash. The possible association between long-enduring time profiles at soft X-rays, microwaves, Ha, and sub-THz wavelengths is discussed. In the decay phase, the Ha 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.
Subject: Sun: activity
Sun: flares
Sun: radio radiation
Sun: X-rays, gamma rays
Country: Inglaterra
Editor: Iop Publishing Ltd
Rights: aberto
Identifier DOI: 10.1088/0004-637X/742/2/106
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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