An Observational Study on Coronal Hard X-ray Sources of Solar Flares

Details An Observational Study on Coronal Hard X-ray Sources of Solar Flares An Observational Study on Coronal Hard X-ray Sources of Solar Flares

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acasn..52..481b&link_type=abstract

Acta Astronomica Sinica, vol. 52, no. 6, p. 481-494

Astronomy and Astrophysics

Astronomy

Sun: Flares, Sun: Corona, Sun: X-Rays

Scientific paper

Observations of solar flares partially occulted by the solar limb provide a valuable diagnostics of coronal hard X-ray emissions due to the absence of generally dominant emissions from flare footpoints. In this paper, a statistical survey of 71 partially occulted flares observed by RHESSI (Reuven Ramaty High-Energy Solar Spectroscopic Imager) is presented. We find that two kinds of hard X-ray sources proposed previously are similar in the aspects of their photon spectra, images, light curves and GOES durations, and the scales of the radiation region, the total thermal energy and the GOES durations are correlated to the separations between the thermal source and the non-thermal source. These results are consistent with some of the unified models proposed in recent years, and indicate that the Masuda flare could not be typical in coronal hard X-ray emission.

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