Physics – Plasma Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10612993l&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue A7, p. 12993-12998
Physics
Plasma Physics
20
Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Waves And Instabilities
Scientific paper
Suprathermal particle populations and loss-cone structures are the most common characteristics of ion and electron velocity distributions observed in space plasmas. We introduce a significant generalization of the family of kappa distributions to a suprathermal loss-cone distribution, applicable to a variety of space plasma modeling. On the basis of this concept a general mirror instability threshold criterion is derived from an energy principle for collisionless plasmas, covering the full range from two-temperature Maxwellians to complex loss-cone conditions occupied by high-energy ion species. We demonstrate that nonthermal plasma characteristics are the source of significant mirror instability threshold reduction where the specific structure of the velocity-space distribution dominates as a regulating mechanism for wave mode excitation.
Leubner Manfred P.
Schupfer N.
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