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Electron Firehose instability and acceleration of electrons in View all abstracts by submitter

Gunnar Paesold   Submitted: 1999-11-04 16:04

solar flaressolar flaresAn electron distribution with a temperature anisotropy T_parallel/T_perp>1 can lead to the Electron Firehose instability (Here _parallel and _perp denote directions relative to the background magnetic field B_0). Since possible particle acceleration mechanisms in solar flares exhibit a preference of energizing particles in parallel direction, such an anisotropy is expected during the impulsive phase of a flare. The properties of the excited waves and the thresholds for instability are investigated by using linearized kinetic theory. These thresholds were connected to the pre-flare plasma parameters by assuming an acceleration model acting exclusively in parallel direction. For usually assumed pre-flare plasma conditions the electrons become unstable during the acceleration process and lefthand circularly polarized waves with frequenci- frequencies of about ~|Omega_p| are excited at parallel propagation. Indications have been found, that the largest growth rates occur at oblique propagation and the according frequencies lie well above the proton gyrofrequency.

Authors: Paesold, G. and Benz, A.O.
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Publication Status: A&A (in press)
Last Modified: 1999-11-04 16:04
Go to main E-Print page  Gamma Rays from Solar Flares
  Particle Acceleration at the Sun and in the Heliosphere
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