Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.3607w&link_type=abstract
American Astronomical Society, SPD meeting #40, #36.07; Bulletin of the American Astronomical Society, Vol. 41, p.869
Astronomy and Astrophysics
Astronomy
Scientific paper
It is generally agreed that the energy for solar flares comes from stressed magnetic fields. However, the mechanisms that convert that energy into the heating of the thermal plasma and the acceleration of nonthermal particles remain a topic of debate. In order to test models governing flare heating and particle acceleration, state of the art numerical codes that can simulate both the interaction of thermal and nonthermal particles in a self-consistent manner and the electromagnetic emission are required. To this end, the HyLoop simulation suite was developed. HyLoop combines a hydrodynamic equation solver with a nonthermal particle tracking code to simulate the thermal and nonthermal dynamics and emission of solar flares. A sophisticated imaging package allows for the direct comparison of simulated results to current and future solar observatories including XRT and RHESSI. In order to test the effects of pitch-angle distribution on flare dynamics and emission, a series of flares were simulated with nonthermal electron beams injected at the loop apex. The pitch-angle distribution of each beam was described by a single parameter and allowed to vary from flare to flare. The lightcurves of the flares in XRT bandpasses showed a distinct signal that was a highly dependent on pitch-angle distribution. The simulated HXR emission in the 3-6 keV bandpass showed the formation and evolution of emission sources that corresponded well to the observations of pre-impulsive flares. The initial conditions of the simulations necessitated a significantly different physical interpretation of this motion than previous work. This ability to test theoretical models of thermal and nonthermal flare dynamics directly with observations allows for the investigation of a wide range of physical processes governing the release of energy in solar flares.
Martens Petrus
Winter Henry (Trae) D. III
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