Other
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9314725o&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Dec. 1, 1988, p. 14725-14728; Reply, p. 14729-14731. Research support
Other
8
Acoustic Instability, Boundary Layer Plasmas, Geomagnetic Tail, Magnetohydrodynamic Stability, Broadband, Earth Magnetosphere, Ion Density (Concentration), Ion Distribution, Space Plasmas
Scientific paper
It is shown here that of the three plasma models for the generation of broadband noise in the magnetotail proposed by Dusenbery and Lyons (1985), two result in the same types of instabilities that are also excited in the Grabbe and Eastman (GE, 1984) model, while the third model introduces other modes not present in the GE model. For the plasma parameters given in the GE model, the ion/ion acoustic instability is a nonresonant one, even though the phase velocity of the excited waves falls within the distribution function of the core ions. The nonlinear saturation mechanism of the ion/ion acoustic instability is the trapping of both the core and the beam ions. In a reply, Dusenbery addresses several ongoing controversies which have resulted from studies of wave particle interactions in the plasma sheet boundary layer.
Akimoto Kazuhiro
Omidi Nojan
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