Particle Acceleration and Fragmented Deposition for an Electric Field Solar Flare Model

Details Particle Acceleration and Fragmented Deposition for an Electric Field Solar Flare Model Particle Acceleration and Fragmented Deposition for an Electric Field Solar Flare Model

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh22a..09k&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH22A-09

Physics

7519 Flares, 7815 Electrostatic Structures, 7843 Numerical Simulation Studies, 7871 Waves And Instabilities

Scientific paper

One of the proposed mechanisms for heating and particle acceleration in solar flares is through the action of a dc electric field upon a thermal plasma. Through particle simulation, we show that the electric fields lead both to direct electron and ion acceleration and to further acceleration due to generation of the electron two-stream instability. For electric and magnetic field strengths and particle densities comparable to flare conditions, we show rapid production of high energy particles comparable to those in γ -ray flares. We discuss the implications of these effects for various models of solar flare formation. In particular, from the observed power-law spectra in flares, compared with that from the numerical simulations, we show that the electric field-plasma interaction produces particle acceleration in the solar flare conditions that is in accord with observed spectral indices when we assume the existance of discrete acceleration regions. We suggest further that these results support a model of fragmented deposition of energy through magnetic reconnection.

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