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|Type:||Artigo de periódico|
|Title:||Sub-thz And Hα Activity During The Preflare And Main Phases Of A Goes Class M2 Event|
Gimenez De Castro C.G.
De Souza R.V.
|Abstract:||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.|
|Editor:||Institute of Physics Publishing|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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