Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh13a1512c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH13A-1512
Physics
7519 Flares, 7549 Ultraviolet Emissions, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
Localized ultraviolet and hard X-ray emission sources provide observational diagnostics of flare-accelerated particles and energy deposition within the chromosphere. The evolution of these emission sources in space and intensity provide insight into the evolving magnetic structure and energy release dynamics of the flaring region. Initial studies of UV and hard X-ray emission indicated a strong co-temporal relationship between the two emission suggesting a common energetic origin often attributed to accelerated particle production resulting from magnetic reconnection in the corona. While confirming the overall temporal correlation, recent spatially-resolved observations have determined that localized correlated UV and HXR sources can occur in spatially distinct locations emphasizing the importance of a complex evolving magnetic topology in governing the spatial emission distributions observed. We present here an analysis of M and X class flares observed in TRACE 1600 Å images and RHESSI 25-100 keV X-rays at high cadence. While observations of the initial impulses show strong co-spatial emission in both wavelengths; however, as the flare evolves, we find significant spatial separations between the temporally correlated emission sources requiring that a time varying complex magnetic structure must be present to transport particles and produce the varied spatial distributions. In addition, we find, for 6 events showing multiple impulses in their X-ray time profiles, that each X-ray impulse corresponds to a distinct distribution of X-ray emission emission sources suggesting that each impulse may correspond to additional magnetic reconnection events is distinct locations within the corona. Finally, we find UV sources which deviate from the expected hard X-ray temporal correlation and instead appear more strongly associated with lower energy thermal X-ray emission indicating thermal processes or the thermal particle acceleration must contribute significantly in the flare energy release process.
Alexander Dave
Coyner Aaron J.
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