Fast Mid-IR Flashes Detected During Small Solar X-Ray Bursts |
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| Authors: | Marta M Cassiano Pierre Kaufmann Rogério Marcon Amauri S Kudaka Adolfo Marun Rodolfo Godoy Pablo Pereyra Arline M Melo Hugo Levato |
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| Institution: | 1.Centro de Radioastronomia e Astrofísica Mackenzie, Escola de Engenharia,Universidade Presbiteriana Mackenzie,S?o Paulo,Brazil;2.Centro de Componentes Semicondutores,Universidade Estadual de Campinas,Campinas,Brazil;3.Instituto de Física Gleb Wataghin,Universidade Estadual de Campinas,Campinas,Brazil;4.Observatório Solar Bernard Lyot,Campinas,Brazil;5.Complejo Astronómico El Leoncito,CONICET,San Juan,Argentina;6.Instituto de Ciencias Atmosféricas y del Espacio,CONICET,San Juan,Argentina |
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| Abstract: | 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. |
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