The X-ray source region of 3He-rich solar energetic particle events

Details The X-ray source region of 3He-rich solar energetic particle events The X-ray source region of 3He-rich solar energetic particle events

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh11d1130k&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH11D-1130

Physics

2118 Energetic Particles, Solar, 7509 Corona, 7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos, 7807 Charged Particle Motion And Acceleration

Scientific paper

The Reuven Ramaty High Energy Spectroscopic Imager RHESSI allows for the first time to study simultaneously the spatial and spectral characteristics of solar hard X-ray emission in detail. In this paper, RHESSI X-ray imaging spectroscopy is used to investigate the source regions of 3He-rich solar energetic particles observed at 1 AU. A series of very large 3He-rich events that occurred between August 19-21, 2002 are investigated. The timing of the simultaneously observed electron events suggests that these particle events are related to a series of GOES M class flares. All events originated from the same active region AR0069 and show a similar behavior: Next to the main flaring loops, TRACE observations additionally show an EUV jet that appears to escape from the Sun with a speed of up to 500 km s-1. X-ray emission is seen from the main flaring loops as well; however, the most prominent source in >30 keV hard X-rays appears to be displaced from the flaring loops, at the footpoint of the field lines along which the jet is moving outward. We investigate the possibility that the HXR footpoint is produced by the downward moving part of the same electron population that escapes to 1 AU, by comparing the derived electron spectrum from the HXR footpoint source with the in situ observed electron spectrum.

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