LARGE-SCALE TRANSPORT OF PLASMA IN THE EARTHS PLASMA SHEET - COMPARATIVE-ANALYSIS FOR ADIABATIC AND NONADIABATIC CASES

A system of multi-fluid MHD-equations is used to compare adiabatic and non-adiabatic transport of the energetic particles in the magnetosphe ric plasma sheet. A ''slow-flow'' approximation is considered to study large-scale transport of the anisotropic plasma consisting of energet ic electrons and protons. Non-adiabatic transport of the energetic pla sma is caused by scattering of the particles in the presence of both w ave turbulence and arbitrary time-varying electric fields penetrating from the solar wind into the magnetosphere. The plasma components are devided into particle populations defined by their given initial effec tive values of the magnetic moment per particle. The spatial scales ar e also given to estimate the non-uniformity of the geomagnetic field a long the chosen mean path of a particle. The latters are used to integ rate approximately the system of MHD-equations along each of these pat hs. The behaviour of the magnetic moment mentioned above and of the pa rameter which characterizes the pitch-angle distribution of the partic les are studied self-consistently in dependence on the intensity of no n-adiabatic scattering of the particles. It is shown that, in the inne r magnetosphere, this scattering influences the particles in the same manner as pitch-angle diffusion does. It reduces the pitch-angle aniso tropy in the plasma. The state of the plasma may be unstable in the cu rrent sheet of the magnetotail. If the initial state of the plasma doe s not correspond to the equilibrium one, then, in this case, scatterin g influences the particles so as to remove the plasma further from the equilibrium state. The coefficient of the particle diffusion across t he geomagnetic field lines is evaluated. This is done by employing the Langevin approach to take the stochastic electric forces acting on th e energetic particles in the turbulent plasma into account. The behavi our of the energy density of electrostatic fluctuations in the magneto sphere is estimated.