Numerical study of the spectrum of broadband electrostatic noise in the magnetotail

Details Numerical study of the spectrum of broadband electrostatic noise in the magnetotail Numerical study of the spectrum of broadband electrostatic noise in the magnetotail

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.1185g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Feb. 1, 1987, p. 1185-1192.

Physics

23

Broadband, Electrostatic Waves, Geomagnetic Tail, Magnetospheric Instability, Noise Spectra, Plasma Layers, Boundary Layers, Electron Energy, Ion Beams

Scientific paper

A numerical study of the spectrum of broadband electrostatic noise (BEN) generated by ion beams in the plasma sheet boundary layer (PSBL) is presented, in which two cases are analyzed. The first case is concerned with a single hot-electron species. In the second case, a second population of cold electrons (arising from diffusion from the lobe into the PSBL) is introduced. The presence of the second electron component in the dispersion relation for generating BEN was found to significantly increase the upper frequency range of the unstable spectrum, enhancing the associated growth rates. It is shown that ion beam instabilities can explain most major features of the observed BEN spectrum. The results explain the gradual rise in the upper frequency range of BEN as a spacecraft approaches the plasma sheet from the lobe, and the sudden jump in that frequency up to near the plasma frequency upon crossing the PSBL.

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