Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2043z&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
2
Scientific paper
We investigate a plasma sheet in astrophysical plasmas as a promising source of non-thermal particles. Two particle acceleration processes in a plasma sheet are presented by 2D particle-in-cell (PIC) simulations. First, we review a powerful acceleration process in a relativistic magnetic reconnection. In this case, particles are directly driven by the strong reconnection electric field Ey around the X-type region. The obtained energy spectrum is quite hard and it is similar to power-law with the index of 1 1.5. Considering another 2D plane of a plasma sheet, we present another particle acceleration process which is related to current driven instability. In this case, a successive acceleration in a mid-plane channel results in the enhancement of the non-thermal particles. The physical mechanisms and characteristic properties of the two acceleration processes are discussed.
Hoshino Masahiro
Zenitani Seiji
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