Electric Field Induced by Particles Accelerated in a Reconnecting Current Sheet

Details Electric Field Induced by Particles Accelerated in a Reconnecting Current Sheet Electric Field Induced by Particles Accelerated in a Reconnecting Current Sheet

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.42s&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

Particle acceleration in a reconnecting current sheet is studied by using 2D-3V particle-in-cell (PIC) simulation code which takes into account the electric and magnetic field induced by particles. The simulations are performed for a reduced particles mass ratio that allows to simulate simultaneously the dynamics of both electrons and protons. The size of a simulation region is chosen to be large enough to include the whole particles trajectories during their acceleration, on the other hand this size is much smaller than the current sheet length. The background electromagnetic field configuration is adopted from an MHD model and involves all three components of magnetic field. Since the time of particle acceleration is much shorter than the typical time of magnetic field variation the background field is assumed to be stationary.
Acceleration rates of electrons and protons are essentially different, thus the electric field may arise due to separation of particles with opposite charges and their different giroradii. In this work we compare particle trajectories found earlier in test-particle simulation with those obtained in PIC simulation. We found that the polarisation electric field and the electric field associated with the Langmuir wave can essentially influence electron trajectories. The corrections of energy spectra of accelerated particles are investigated. Obtained results are applied for particle acceleration in solar flares and Earth's magnetotail.

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