Effect of magnetospheric convection on thermal plasma in the inner magnetosphere

Details Effect of magnetospheric convection on thermal plasma in the inner magnetosphere Effect of magnetospheric convection on thermal plasma in the inner magnetosphere

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.5923k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A4, p. 5923-5934

Physics

Geophysics

7

Convective Flow, Ion Temperature, Magnetic Fields, Magnetospheric Instability, Plasma Density, Thermal Plasmas, Geophysics, High Temperature Plasmas, Ionospheric Drift, Particle Trajectories, Plasma Diffusion, Plasma Dynamics, Upper Ionosphere

Scientific paper

The effects of E x B convection on the distribution of plasma parameters in the inner magnetosphere have been examined. Analytical solutions describing density distributions along convective trajectories in the equatorial plane have been found. These solutions suggest the following dependence of plasma concentration n on the magnetic field B along convective trajectories: n proportional to B(exp alpha), where the parameter alpha varies between alpha is less than or = between 4/3 and 2. The alpha = 2 case corresponds to disregarding transport parallel to B. The lower bound alpha = 4/3 describes the situation when parallel transport dominates over convective motions perpendicular to B. A solution has also been obtained describing the effect of convection on diffusive equilibrium profiles in the dayside plasmasphere. In addition, ion temperature variations due to adiabatic effects associated with plasma convection have been analyzed in detail. Convective drifts lead to ion temperature anisotropies with the value and sign of the anisotropy contingent on density and temperature variations, local time, and the location of the convective trajectory with respect to the location of the plasmapause. We have also found that convective motions lead to a substantial exchange of energy between the ionosphere and the plasmasphere through electron heat fluxes.

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