Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0131d&link_type=abstract
American Astronomical Society, SPD meeting #37, #13.1; Bulletin of the American Astronomical Society, Vol. 38, p.220
Other
Scientific paper
We use the unprecedented spectral and spatial resolution of RHESSI to explore the behavior of electrons and their associated currents in solar flares. We previously found that, over a wide range of flare X-ray magnitudes, the integrated photon flux above 20 keV asymptotically approaches a limiting value as the flare magnitude increases. This suggests a saturation of the photon production in flares due to the dominance of return current losses over Coulomb collisions losses. In this report, we utilize RHESSI spectral images to identify individual substructures within each event and to determine an estimate of the effective surface area, and therefore photon fluxes, for each substructure identified. We interpret these individual substructures as independent current systems triggered by the flare initiation and use them to understand more fully the temporal and spatial nature of the flare energy release. We find that the hard X-ray fluxes emanating from the individual substructures are not temporally correlated with each other, nor do they all show signs of being return current dominated. We discuss what this implies for particle production and transport in large solar flares.
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