## Electron acceleration in solar flares
by spatially random DC electric fields,
Phys. & Chemist. Earth, 24, 269, 1999

## Abstract

A global model
for the acceleration of electrons in the
framework of the * statistical flare* model is presented. In such a
model, solar flares are the result of an internal
Self-Organised Critical (SOC) process in a complex, evolving,
and highly inhomogeneous active
region. We have developed a 3D cellular automaton model that
simulates flaring activity which extends over an active subflaring
background. We derive the spatio-temporal evolution of
the active region and the resulting energy release time series,
which is associated with an electric field time series.
We trace an injected electron distribution in this environment,
assuming that the acceleration process is due to randomly
placed, localised DC electric fields.

Our numerical results regarding the kinetic energy distribution
of the accelerated electrons show a power-law or an exponential
behaviour, depending upon the maximum trapping time of
the energetic particles inside the acceleration volume.

* Keywords: * Particle acceleration - Sun: flares