RHESSI Discovery of a Coronal Non-Thermal Hard X-Ray Source in the 23 July 2002 Gamma-Ray Line Flare

Details RHESSI Discovery of a Coronal Non-Thermal Hard X-Ray Source in the 23 July 2002 Gamma-Ray Line Flare RHESSI Discovery of a Coronal Non-Thermal Hard X-Ray Source in the 23 July 2002 Gamma-Ray Line Flare

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3207l&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

6

Scientific paper

The Reuven Ramaty High Energy Solar spectroscopic Imager (RHESSI) observations of the gamma-ray line flare of 2002 July 23, show that in the ˜8 minute rise prior to the impulsive phase, the hard X-ray emission comes from a coronal source which has no counterpart in the simultaneous TRACE EUV images or in the Hα images. The spectrum above ˜10 keV fits to a double-powerlaw shape with break energies at ˜20-40 keV and exponents of ˜5 below and ˜7 above, with no obvious thermal emission above ˜10 keV. This coronal nonthermal source implies that substantial energy release and electron acceleration occurs before the impulsive phase.

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