Generation of high-frequency broadband electrostatic noise - The role of cold electrons

Details Generation of high-frequency broadband electrostatic noise - The role of cold electrons Generation of high-frequency broadband electrostatic noise - The role of cold electrons

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.5807s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, June 1, 1987, p. 5807-5819.

Physics

59

Broadband, Electron Plasma, Electrostatics, Magnetohydrodynamic Stability, Noise Generators, Space Plasmas, Boundary Layer Plasmas, Ion Acoustic Waves, Ion Beams, Wave Generation

Scientific paper

Broadband electrostatic noise (BEN) is commonly observed in the plasma sheet boundary layer in association with ion beams. The generation of these waves in a plasma consisting of an ion beam and a background of hot ions, hot electrons, and cold electrons is investigated. The cold electrons are of ionospheric origin. A complete, systematic study of electrostatic ion beam instabilities, including cold electrons, has been done, and it is shown that for the plasma configuration described, four instabilities can be excited: (1) ion acoustic, (2) Buneman, (3) beam resonant, and (4) electron acoustic instabilities. A low and high beam temperature division is shown to exist that separates when different instabilities can be excited. For typically observed parameters in the plasma sheet boundary layer, the ion beams lie in the high-temperature regime. In this regime, the beam resonant and electron acoustic instabilities are excited, and these instabilities can account for the high-frequency (higher than 500 Hz), low-power portion of the BEN spectrum. In the absence of cold electrons, no such wave growth occurs.

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