Fast Mid-IR Flashes Detected During Small Solar X-Ray Bursts

作者：Cassiano Marta M; Kaufmann Pierre^*; Marcon Rogerio; Kudaka Amauri S; Marun Adolfo; Godoy Rodolfo; Pereyra Pablo; Melo Arline M; Levato Hugo

来源：Solar Physics, 2010, 264(1): 71-79.

DOI：10.1007/s11207-010-9564-x

• Mid-IR solar flares
• IR solar flashes
• Solar flares
• Mid-IR plages
• 10 mu m continuum flare emissions

Solar observations in the mid-infrared 8 -aEuro parts per thousand 14 mu m 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 -aEuro parts per thousand 130 solar flux units. At the solar surface the estimated rapid brightenings represented a temperature enhancement of 50 -aEuro parts per thousand 150 K.

• 出版日期2010-6