Ion acoustic instabilities excited by injection of an electron beam in space

Details Ion acoustic instabilities excited by injection of an electron beam in space Ion acoustic instabilities excited by injection of an electron beam in space

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.2011o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, March 1, 1988, p. 2011-2015. Research supported by the University of

Physics

14

Beam Injection, Ion Acoustic Waves, Space Plasmas, Electron Beams, Plasma Interaction Experiment, Spacecraft Charging

Scientific paper

It is shown by means of numerical simulations that an injection of a tenuous suprathermal electron beam into a fully ionized plasma from spacecraft can lead to an excitation of ion acoustic waves. The return current carried by the ambient electrons has a drift speed that is much slower than the beam speed, so that these electrons can excite the ion waves via wave-particle interaction. Numerical simulations confirm the excitation of ion acoustic waves and the acceleration of ions near the spacecraft producing a high-energy tail.

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