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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 2
Ann. Geophys., 13, 111–117, 1995
https://doi.org/10.1007/s00585-995-0111-2
© European Geosciences Union 1995
Ann. Geophys., 13, 111–117, 1995
https://doi.org/10.1007/s00585-995-0111-2
© European Geosciences Union 1995

  28 Feb 1995

28 Feb 1995

Effects of spatial diffusion in the inner plasma sheet and the structure of the diffusion tensor

V. E. Zakharov and M. I. Pudovkin V. E. Zakharov and M. I. Pudovkin

Abstract. A standard pair of equations is used to describe the behaviour of a single monoenergetic particle (proton or electron) population on a geomagnetic flux tube drifting in the magnetosphere. When particle losses from the drifting flux tube into the ionosphere are neglected, this behaviour is adiabatic in a thermodynamic sense. For a population of particles with an isotropic pitch-angle distribution, the generalization of that system of equations is obtained by adding radial and azimuthal spatial diffusion terms. The magnetic field is taken to be dipolar in the inner magnetosphere. The potential electric field is assumed to consist of magnetospheric convection and corotation components. Experimental data are used to estimate the radial equatorial profiles of the plasma sheet pressure. Assuming that the local time and L-shell variations are separable and supposing steady-state conditions, the expressions for the diffusion tensor components are evaluated. The influence of spatial diffusion on the radial and azimuthal profiles of the plasma pressure in the inner plasma sheet is also discussed.

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