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P: Plasmaphysik

P 28: Sonstiges (Poster)

P 28.5: Poster

Monday, March 9, 1998, 18:00–20:00, P 2

Large-scale transport in the earth’s plasmasheet. Multi-fluid magnetohydrodynamics — •V.E. Zakharov 1) and C.-V. Meister 2) — 1) State Univ. Kaliningrad, 2) Astrophysical Inst. Potsdam

A system of multi-fluid MHD-equations is used to compare adiabatic and non-adiabatic transport of the energetic particles in the magnetospheric plasma sheet. A slow-flow approximation is considered to study large-scale transport of the anisotropic plasma consisting of energetic electrons and protons. The non-adiabatic transport of the energetic plasma is caused by scattering of the particles by wave turbulence and arbitrary time-varying electric fields penetrating from the solar wind into the magnetosphere. The plasma components are divided into particle populations defined by their given initial effective values of the magnetic moment per particle. The behaviour of the magnetic moments and of the parameter which characterizes the pitch-angle distribution of the particles are studied self-consistently in dependence on the intensity of non-adiabatic scattering of the particles. It is shown that, in the inner magnetosphere, the non-adiabatic scattering reduces the pitch-angle anisotropy in the plasma. But the plasma state may be unstable in the current sheet of the magnetotail. The coefficient of the particle diffusion across the geomagnetic field lines is evaluated using the Langevin approach. The behaviour of the energy density of electrostatic fluctuations in the magnetosphere is estimated.