Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.5404a&link_type=abstract
American Astronomical Society Meeting 204, #54.04; Bulletin of the American Astronomical Society, Vol. 36, p.758
Astronomy and Astrophysics
Astronomy
Scientific paper
Chromospheric hard X-ray emission in a solar flare generally occurs in two magnetically connected 'footpoint' regions. Recent spatially-resolved hard X-ray observations carried out using the RHESSI spacecraft have shown that the ratio of total X-ray fluxes from two such footpoints is time-dependent and demonstrates a weak but detectable energy-dependence. We use a Fokker-Planck code to identify possible scenarios that could reproduce the observed dependence of footpoint asymmetry on time and energy. The code, which we have benchmarked against analytical results in the limit of collisionless precipitation from a symmetric flaring loop, includes collisional friction and pitch angle scattering, asymmetric magnetic mirroring, and a source term that can be prescribed arbitrarily. Using this model, we examine in particular whether the observed imbalance in hard X-ray emission from the two footpoints in a flare can be attributed primarily to asymmetry in the loop magnetic structure or asymmetry in the acceleration process.
This work was funded partly by NASA (NAS5-02048) and by the United Kingdom Engineering and Physical Sciences Research Council.
Alexander Dave
McClements K. G.
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