Electron Acceleration from Electron-Ion Plasma Cloud Moving across a Magnetic Field

Details Electron Acceleration from Electron-Ion Plasma Cloud Moving across a Magnetic Field Electron Acceleration from Electron-Ion Plasma Cloud Moving across a Magnetic Field

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jpsj...67..870s&link_type=abstract

Journal of the Physical Society of Japan, Volume 67, Issue 3, pp. 870 (1998).

Physics

2

Scientific paper

The dynamics of the electron-ion plasma cloud moving perpendicular to an ambient magnetic field in the background plasma is investigated by means of a three-dimensional, electromagnetic, and relativistic particle simulation code. The simulation results show that the cloudseparates into electrons and ions due to their gyromotions withLarmor radius of V0/ωcj (V0 is the initialcloud velocity and ωcj is the cyclotron frequency of species j). Consequently, electromagnetic and whistler waves are excited from the cloud due to coherent gyration of cloud electrons.In addition, Langmuir waves are also excited along a magnetic field.It is shown that cloud electrons are accelerated by Langmuir wavesalong the magnetic fieldand the population inversion is created in the velocitydistribution of cloud electrons. The accelerationmechanism of cloud electrons is due to Landau resonance between Langmuir waves and cloud electrons. We apply our results to theelectron acceleration mechanism from plasma cloud produced near a comet nucleus, which may explain recent observation of X-ray from comet Hyakutake.

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