A cold, tenuous solar flare: acceleration without heating

Fleishman, G.D., Kontar, E.P. , Nita, G.M. and Gary, D.E. (2011) A cold, tenuous solar flare: acceleration without heating. Astrophysical Journal Letters, 731(1), (doi:10.1088/2041-8205/731/1/L19)

Fleishman, G.D., Kontar, E.P. , Nita, G.M. and Gary, D.E. (2011) A cold, tenuous solar flare: acceleration without heating. Astrophysical Journal Letters, 731(1), (doi:10.1088/2041-8205/731/1/L19)

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Abstract

We report the observation of an unusual cold, tenuous solar flare, which reveals itself via numerous and prominent non-thermal manifestations, while lacking any noticeable thermal emission signature. RHESSI hard X-rays and 0.1-18 GHz radio data from OVSA and Phoenix-2 show copious electron acceleration (1035 electrons s-1 above 10 keV) typical for GOES M-class flares with electrons energies up to 100 keV, but GOES temperatures not exceeding 6.1 MK. The imaging, temporal, and spectral characteristics of the flare have led us to a firm conclusion that the bulk of the microwave continuum emission from this flare was produced directly in the acceleration region. The implications of this finding for the flaring energy release and particle acceleration are discussed.

Item Type:Articles (Letter)
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kontar, Dr Eduard
Authors: Fleishman, G.D., Kontar, E.P., Nita, G.M., and Gary, D.E.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Astrophysical Journal Letters
ISSN:2041-8205
ISSN (Online):2041-8213
Published Online:22 March 2011
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