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Solar Phys (2008) 253: 199214 DOI 10.1007/s11207-008-9234-4

Summary: Solar Phys (2008) 253: 199214
DOI 10.1007/s11207-008-9234-4
Particle Interactions with Single or Multiple 3D Solar
Reconnecting Current Sheets
A. Anastasiadis C. Gontikakis C. Efthymiopoulos
Received: 29 November 2007 / Accepted: 12 June 2008 / Published online: 8 August 2008
Springer Science+Business Media B.V. 2008
Abstract The acceleration of charged particles (electrons and protons) in flaring solar active
regions is analyzed using numerical experiments. The acceleration is modeled as a stochastic
process taking place by the interaction of the particles with local magnetic reconnection
sites via multiple steps. Two types of local reconnecting topologies are studied: the Harris-
type and the X-point. A formula for the maximum kinetic energy gain in a Harris-type
current sheet, found in a previous work of ours, fits well the numerical data for a single
step of the process. A generalization is then given approximating the kinetic energy gain
through an X-point. In the case of the multiple step process, in both topologies the kinetic
energy distribution of the particles is found to acquire a practically invariant form after a
small number of steps. This tendency is interpreted theoretically. Other characteristics of
the acceleration process are given, such as the mean acceleration time and the pitch angle
distributions of the particles.


Source: Anastasiadis, Anastasios - Institute for Space Applications and Remote Sensing, National Observatory of Athens


Collections: Physics