Fast Mid-IR flashes detected during small solar X-Ray bursts
Tipo
Artigo
Data de publicação
2010
Periódico
Solar Physics
Citações (Scopus)
4
Autores
Cassiano M.M.
Kaufmann P.
Marcon R.
Kudaka A.S.
Marun A.
Godoy R.
Pereyra P.
Melo A.M.
Levato H.
Kaufmann P.
Marcon R.
Kudaka A.S.
Marun A.
Godoy R.
Pereyra P.
Melo A.M.
Levato H.
Orientador
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Resumo
Solar observations in the mid-infrared 8-14 μm band continuum were carried out with cadence of 5 frames per second, in December 2007. Rapid small heated sources, with a typical duration of the order of seconds, were found on the bright plage-like areas around sunspots, in association with relatively weak GOES soft X-ray bursts. This work presents the analysis of fast mid-infrared flashes detected during a GOES B2.0-class event on 10 December 2007, beginning at about 10:40 UT. Rapid brightness temperature enhancements of 0.5 to 2.0 K were detected at the Earth by a microbolometer array, using a telescope with 10.5 cm diameter aperture producing a diffraction-limited photometric beam of 25 arc sec. The minimum detectable temperature change was of 0.1 K. The corresponding fluxes are 30-130 solar flux units. At the solar surface the estimated rapid brightenings represented a temperature enhancement of 50-150 K. © 2010 Springer Science+Business Media B.V.