Physics
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11109106y&link_type=abstract
Journal of Geophysical Research, Volume 111, Issue A9, CiteID A09106
Physics
33
Interplanetary Physics: Energetic Particles (7514), Interplanetary Physics: Plasma Waves And Turbulence, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: General Or Miscellaneous
Scientific paper
Since the early days of plasma physics research suprathermal electrons were observed to be generated during beam-plasma laboratory experiments. Energetic electrons, often modeled by $\kappa$ distributions, are also ubiquitously observed in space. Various particle acceleration mechanisms have been proposed to explain such a feature, but all previous theories rely on either qualitative analytical method or on non-self-consistent approaches. This paper discusses the self-consistent acceleration of electrons to suprathermal energies by weak turbulence processes which involve the Langmuir/ion-sound turbulence and the beam-plasma interaction. It is discussed that the spontaneous scatttering process, which is absent in the purely collisionless theory, is singularly responsible for the generation of $\kappa$ distributions. The conclusion is that purely collisionless Vlasov theory cannot produce suprathermal population.
Rhee Tongnyeol
Ryu Chang-Mo
Yoon Peter H.
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