A cold, tenuous solar flare: Acceleration without heating

Document Type

Article

Publication Date

4-10-2011

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. © 2011. The American Astronomical Society. All rights reserved.

Identifier

79955602720 (Scopus)

Publication Title

Astrophysical Journal Letters

External Full Text Location

https://doi.org/10.1088/2041-8205/731/1/L19

e-ISSN

20418213

ISSN

20418205

Issue

1 PART II

Volume

731

Grant

0200226

Fund Ref

European Commission

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