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

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

2010-05-11

arxiv.org/abs/1005.1923v1

Solar Phys (2010) 264: 71-79

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages including 6 figures. Accepted by Solar Physics, April 2010

Scientific paper

Solar observations in the mid-infrared 8-14 \mu\m band continuum were carried out with cadence of 5 frames per second, in December 2007. Rapid small heated sources, with 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 field-of-view of 25 arcsec. 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 were of 50-150 K

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