First Gamma-Ray Images of a Solar Flare

Details First Gamma-Ray Images of a Solar Flare First Gamma-Ray Images of a Solar Flare

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3203h&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

Scientific paper

We present the first gamma-ray images of a solar flare, obtained with the Reuven Ramaty High Energy Solar spectroscopic Imager (RHESSI) for the X4.8 flare of 2002 July 23. Two rotating modulation collimators (35 & 180 resolution) provided images of the narrow deuterium line at 2.223 MeV formed by thermalization and capture of neutrons produced in energetic ion collisions, the 3.25-6.5 MeV band that includes the prompt de-excitation lines of C and O, and the 0.30.5 and 0.7-1.4 MeV bands that are dominated by electron-bremsstrahlung. The centroid of the 2.223 MeV image was found to be displaced by ˜20(±6) arcsec from that of the 0.3-0.5 MeV band, implying a difference in acceleration and/or propagation between the accelerated electron and ion populations near the Sun.

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