Abstract
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 cloud separates into electrons and ions due to their gyromotions with Larmor radius of V 0 /ω c j ( V 0 is the initial cloud velocity and ω c j 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 waves along the magnetic field and the population inversion is created in the velocity distribution of cloud electrons. The acceleration mechanism of cloud electrons is due to Landau resonance between Langmuir waves and cloud electrons. We apply our results to the electron acceleration mechanism from plasma cloud ...
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