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

KAUFMANN, PIERRE; MARCON, ROGÉRIO; GIMÉNEZ DE CASTRO, C. GUILLERMO; WHITE, STEPHEN M.; RAULIN, JEAN-PIERRE; CORREIA, EMILIA; FERNANDES, LUIS OLAVO; DE SOUZA, RODNEY V.; GODOY, RODOLFO; MARUN, ADOLFO; PEREYRA, PABLO

ASTROPHYSICAL JOURNAL

IOP PUBLISHING LTD

Año: 2011 vol. 742

0004-637X

Radio 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.