Electron velocity space hole modes and narrowband electrostatic noise in the distant tail

Details Electron velocity space hole modes and narrowband electrostatic noise in the distant tail Electron velocity space hole modes and narrowband electrostatic noise in the distant tail

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..747c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, July 1989, p. 747-750.

Physics

20

Electromagnetic Noise, Electron Distribution, Electrostatic Waves, Geomagnetic Tail, Narrowband, Particle Motion, Propagation Velocity, Shock Wave Propagation

Scientific paper

Narrowband electrostatic noise (NEN) is frequently observed upstream of the slow shocks in the distant tail. It is suggested that NEN represents a nonstandard plasma wave mode which results from a hole in the low energy electron velocity distribution. A very simple model which plausibly indicates how a hole might be formed by the interaction of the electrons with the slow shock is presented. The hole mode is destabilized by a positive slope in the parallel electron distribution and/or by a weak beam of energetic ions which escape upstream from the slow shock.

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