Low-frequency electrostatic instabilities excited by injections of an electron beam in space

Details Low-frequency electrostatic instabilities excited by injections of an electron beam in space Low-frequency electrostatic instabilities excited by injections of an electron beam in space

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9410103h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Aug. 1, 1989, p. 10103-10110.

Other

3

Beam Injection, Electron Beams, Electrostatic Waves, Geomagnetism, Magnetohydrodynamic Stability, Plasma-Particle Interactions, Electron Energy, Field Strength, Ion Cyclotron Radiation, Space Plasmas, Velocity Distribution

Scientific paper

One-dimensional particle simulations have been carried out to study the low-frequency broadband electrostatic noise that propagates almost perpendicularly from the magnetic field line when a nonrelativistic electron beam is injected into space from a spacecraft. For T(e) = T(i) the electrostatic ion cyclotron waves appear as well as the waves near the lower hybrid frequency. When the magnetic field is reduced so that Omega(e) is much less than omega(pe) in a nonisothermal plasma, T(e) greater than T(i) oblique ion acoustic instabilities appear to propagate almost perpendicular to the magnetic field. In addition, a very low frequency mode at omega much less than Omega(i) is found to be generated by the electrons flowing into the conductor. Both the injected beam electrons as well as the ambient electrons flowing into the spacecraft are responsible for generating those instabilities, which accelerate ions perpendicular to the magnetic field.

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