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Article Dans Une Revue Annales Geophysicae Année : 1999

Nongyrotropic particle distributions in space plasmas

Résumé

In nonstationary, strong inhomogeneous or open plasmas particle orbits are rather complicated. If the nonstationary time scale is smaller than the gyration period, if the inhomogeneity scale is smaller than the gyration radius, i.e. at magnetic plasma boundaries, or if the plasma has sources and sinks in phase space, then nongyrotropic distribution functions occur. The stability of such plasma configurations is studied in the framework of linear dispersion theory. In an open plasma nongyrotropy drives unstable waves parallel and perpendicular to the background magnetic field, whereas in the gyrotropic limit the plasma is stable. In nonstationary plasmas nongyrotropy drives perpendicular unstable waves only. Temporal modulation couples a seed mode with its side lobes and thus it renders unstable wave growth more difficult. As an example of an inhomogeneous plasma a magnetic halfspace is discussed. In a layer with thickness of the thermal proton gyroradius a nongyrotropic distribution is formed which may excite unstable parallel and perpendicular propagating waves.
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Dates et versions

hal-00316586 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00316586 , version 1

Citer

U. Motschmann, K. H. Glassmeier, A. L. Brinca. Nongyrotropic particle distributions in space plasmas. Annales Geophysicae, 1999, 17 (5), pp.613-622. ⟨hal-00316586⟩

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