 
Summary: Acceleration and Radiation Model of Particles in
Solar Active Regions
Anastasios Anastasiadis
, Cyril Dauphin
and Nicole Vilmer
National Observatory of Athens, Institute for Space Applications and Remote Sensing,
Penteli, GR15236 GREECE
LESIA, Observatoire de ParisMeudon, 92195 Meudon Cedex, FRANCE
Abstract. Cellular Automata (CA) models have successfully reproduced several statistical proper
ties of solar flares such as the peak flux or the total flux distribution. We are using a CA model based
on the concept of self organized criticality (SOC) to model the evolution of the magnetic energy
released in a solar flare. Each burst of magnetic energy released is assumed to be the consequence
of a magnetic reconnection process, where the particles are accelerated by a direct electric field.
We relate the difference of energy gain of particles (alpha particles, protons and electrons) to the
magnetic energy released and we calculate the resulting kinetic energy distributions and the emitted
radiation.
Keywords: Sun: Solar flares; particle acceleration; radiation; selforganized criticality
PACS: 96.60.j; 96.6.qe; 96.50.Pw; 96.60.tk
