Hard X-Ray Spectral Observation of a High-Temperature Thermal Flare

Details Hard X-Ray Spectral Observation of a High-Temperature Thermal Flare Hard X-Ray Spectral Observation of a High-Temperature Thermal Flare

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...648.1239k&link_type=abstract

The Astrophysical Journal, Volume 648, Issue 2, pp. 1239-1246.

Astronomy and Astrophysics

Astronomy

5

Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

We report on the analysis of a thermal flare observed by a newly developed balloon-borne hard X-ray spectrometer. This instrument uses CdTe detectors and can observe the 20-120 keV hard X-ray range, with 3.0 keV energy resolution at 60 keV. During the 2002 May 24 flight, it successfully observed a class M1.1 flare. This flare observation shows no detectable flux above 35 keV, and its spectrum is consistent with a superhot thermal source with the temperature varying from 44 to 20 MK. Partial observation of the flare by the RHESSI satellite is consistent with this result. The Nobeyama Radio Polarimeters (NORP) observation of this flare shows no detectable polarization. The NORP light curves show impulsive features at 3.75 GHz that can be explained as thermal gyrosynchrotron emission, and this flux is consistent with observed X-ray spectra if a magnetic field of 275 G is assumed. Slower varying features seen in the NORP data are consistent with the lower temperature (``hot'') thermal source of 10-15 MK seen in soft X-rays. We conclude that this flare shows no observable signature of nonthermal electrons, and all observed features are consistent with a purely thermal event. This serves as a strong indication that a nonthermal electron beam is not always the dominant energy source of plasma heating in solar flares.

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