Abstract
A comparison is made between a plasma system with three components (thermal electrons and superthermal electrons, and also nondrifting ions in a magnetic field, that is taken to be of magnitude of the magnetic field of the yearth) and a four-component system with two species of electrons, (thermal and superthermal) and two species of ions, one nondrifting and one drifting slowly, by using the method of particle simulation. This first 1-D electrostatic approximation used for a simple model of an ionospheric plasma with β < me/mi has the aim to observe the influence of the superthermal electrons on the plasma oscillatory properties, on the electrostatic characteristics and on specific energies of such a periodic plasma system and the interaction between the considered particles species. The observed linear growth in a very short time and the nonlinear stage of the excited instabilities, with specific amplitude fluctuations under the form of successive short growths and Landau-type dampings, demonstrate that the phenomena involved in the two considered systems are essentially nonlinear ones.
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