Physics – Plasma Physics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..669..800l&link_type=abstract
PLASMA PHYSICS: 11th International Congress on Plasma Physics: ICPP2002. AIP Conference Proceedings, Volume 669, pp. 800-803 (2
Physics
Plasma Physics
Magnetohydrodynamics And Plasmas, Fokker-Planck And Vlasov Equation, Microinstabilities
Scientific paper
Numerous in situ observations indicate clearly the presence of non-thermal electron and ion structures as ubiquitous and persistent feature of most space plasma environments. The three detected dominant deviations from multi-temperature Maxwellians are suprathermal particle populations loss-cone structures and, provided by recent high resolution data analysis, gyrophase-bunched electron and ion distributions at plasma boundary layers. After clarifying the occurrence of specific non-thermal features in space plasmas different generation mechanisms of energetic particles are discussed in view of coronal/solar wind and magnetospheric conditions. We demonstrate from a Fokker-Planck approach how Landau interaction ultimately leads to kappa-distributions, favored in astrophysical plasma modeling and show that these distributions turn out theoretically as consequence of a nonextensive entropy approach. In addition, magnetic field gradients can act as catalyst for the generation of energetic populations up to relativistic energy due to synergetic effects in a multi-stage acceleration process, relevant for solar flare conditions. With regard to wave-particle interaction processes and instability analysis we present a class of highly general analytical representations of velocity space distributions, shown to model accurately observed complicated situations ranging from multi-component, two-temperature high energy tail formations and loss-cone features to non-gyrotropic distributions, where Maxwellians are recovered as special case.
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