Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp51c..16d&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP51C-16
Other
7507 Chromosphere, 7509 Corona, 7514 Energetic Particles (2114), 7519 Flares, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
We use the unprecedented spatial and spectral resolution of the RHESSI telescope to investigate the temporal evolution of thermal and non-thermal hard X-ray emission in spatially independent substructures in 2 major flares: the 2006 December 6 X6.5 and the 2003 November 2 X 8.3, one of the large Halloween '03 flares. The hard X-ray emission in these flares is concentrated in a number of distinct sources displaying independent temporal and spectral evolution. We find that while the total flare energy content rises during the impulsive phase, the non-thermal hard X-ray fluxes in many of the identified substructures saturates after an initial rise phase. In a previous study, we have investigated this non-thermal flux saturation at the peak of the hard X-ray emission in 10 flares spanning a factor of ~200 (M1 to X17) in the GOES 1-8Å~peak flux. The indication was that the saturation was due to a transition in the dominant energy loss mechanism from Coulomb collisions to return current ohmic dissipation as the flare magnitude increased. In this study, we analyze the temporal variation of the hard X-ray fluxes within two large flares, and infer the spectral properties of the emitting electron population, as the flare transits from from one energy loss regime to the other. We find that the increase in the non-thermal hard X-ray flux in the substructures towards saturation is mainly due to a hardening of the spectrum rather than an increase in the normalized flux in the electron beams.
Alexander Dave
Daou Antoun G.
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