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Nongyrotropy in magnetoplasmas: simulation of wave excitation and phase space diffusion

Motschmann, U. and Kafemann, H.(1) and Scholer, M.(2) (1997) Nongyrotropy in magnetoplasmas: simulation of wave excitation and phase space diffusion. Annales Geophysicae, 15, pp. 603-613. Springer Verlag, Berlin.

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Nongyrotropic (gyrophase bunched) ion distributions in a magnetoplasma are studied by analytical methods and by 2-dimensional hybrid code simulations. Nongyrotropy may not occur in a plasma being simultaneously homogenous, stationary, and solenoidal in phase space. A detailed study is performed for a homogeneous and stationary plasma with sources and sinks in pase space. The analytical investigation cast in the framework of linearized Maxwell-Vlasov Theory yields a coupling of low frequeny lefthanded, righthanded, and longitudinal modes. Nongyrotropic ion distributions are unstable; they excite lefthanded waves. The growth rate is comparable to that of the iron ring instability. The hybrid code simulation stufy vonfirms the expected propagation direction parallelto the background magnetic field. Three diffusion processes are studied; arc lengthening, arc broadening, and arc radius decreasing corresponding to particle energy diffusion. the characteristic diffusion time scales are found to be of the order of 10_1 wave cycles.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1997,
Title:Nongyrotropy in magnetoplasmas: simulation of wave excitation and phase space diffusion
AuthorsInstitution or Email of Authors
Kafemann, H.(1)UNSPECIFIED
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 603-613
Publisher:Springer Verlag, Berlin
Keywords:Plasma physics, wave propagation particle simulation
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:UNSPECIFIED
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Institut für Planetenerkundung
Deposited By: elib DLR-Beauftragter
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 09:52

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