Plasma waves excited in the upstream region by density gradient of energetic-particle streams associated with the earth's bow shock

Physics

Scientific paper

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Energetic Particles, Magnetopause, Particle Density (Concentration), Plasma Waves, Wave Excitation, Bow Waves, Electrostatic Waves, High Energy Electrons, Ion Acoustic Waves, Shock Waves

Scientific paper

The present study is concerned with the excitation of plasma waves at the boundaries of the streams of energetic particles which are associated with the earth's bow shock. The analysis was motivated by observational results acquired with the ISEE spacecraft (Parks et al., 1981). It is shown theoretically that the density gradient of energetic ions can only excite ion waves, whereas that of energetic electrons can excite both ion waves and Langmuir waves. This conclusion appears to be consistent with observations.

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