Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2923o&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2923-2926
Other
86
Broadband, Computerized Simulation, Drift Rate, Electromagnetic Noise, Electrostatic Waves, Geomagnetic Tail, Noise Spectra, Plasma Drift, Satellite Observation, Solitary Waves, Electron Beams, Ion Beams, Nonlinearity, Poisson Equation, Spatial Distribution, Thermal Emission
Scientific paper
We present simulations of the electrostatic solitary waves (ESW) as observed by GEOTAIL which have been identified as broadband electrostatic noise (BEN) in previous studies. We have found that ESW are generated as a result of the nonlinear coalescence of strong electrostatic waves excited by an electrostatic beam instability. This instability is driven by an electron beam drifting relative to the ions and other electrons drifting with the ions. As a necessary condition for generation of ESW, the ion thermal velocity must be large enough so as to prevent decay of the electrostatic waves to ion acoustic waves. Another condition is that the density of the electron beam drifting relative to the ions must be larger that 30% of the plasma density.
Kojima Hedeyasu
Matsumoto Haru
Omura Yuji
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