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**Session 18 - Flares I.**

*Oral session, Tuesday, July 01*

*Ballroom A, Chair: Mona Hagyard*

## [18.04] Stochastic Acceleration of Low Energy Electrons in Plasma with Finite Temperature

*J. Pryadko (Stanford University), V. Petrosian (Stanford University)*
In this paper we extend our earlier work (Pryadko and
Petrosian, ApJ. 1997, vol.482) on the acceleration of
low-energy electrons by plasma turbulence to include the
effects of finite temperature of the plasma. We consider
the resonant interaction of such electrons and the whole
transverse branch of plasma waves propagating along the
magnetic field. The importance of the plasma parameter
\alpha = ømega_pe/Ømega_e (the ratio of electron
plasma frequency to electron gyrofrequency) in the
dynamics of the charged particles is emphasized. We show
that our earlier published results for acceleration of
low-energy electrons can be applied to the case of finite
temperature if the sufficient level of turbulence is
present. From comparison of the acceleration rate of the
particles with the decay rate of the waves they interact
with, we determine the energy density of waves, as a
fraction of the magnetic energy density, required for
acceleration of a substantial fraction of the background
plasma electrons. The dependence of this value on the
plasma and turbulence parameters is described through the
numerical results. The approximate analytical expression
is derived for the case of super-thermal electrons.

This work was supported by NSF grant ATM 93-11888 and NASA
grants NAGW 1976 and 2FEX404.

**Program
listing for Tuesday**