Computer Science
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..24..121a&link_type=abstract
Advances in Space Research, Volume 24, Issue 1, p. 121-124.
Computer Science
1
Scientific paper
The analysis of electric field and plasma observations in the plasma sheet and auroral zone points to the existence of low frequency turbulence which leads to intensive plasma mixing and equilibration of the electron and ion temperatures across the plasma sheet. Particle transport by turbulent electric fields may be the main process of plasma sheet formation. The suggestion about local equality of large-scale convection transport and quasi-diffusive turbulence permits to solve the Grad-Shafranov problem and to determine the dependence of the plasma pressure from the magnetic vector potential. The main input parameter of the model is the large-scale distribution of the electrostatic potential. This is computed from the Volland-Stern model for the ionospheric electric field and Tsyganenko's model of the magnetic field. The plasma distribution across the tail at different geocentric distances is obtained. Its dependence on the interplanetary magnetic field component Bz is analyzed. It is shown that if interplanetary magnetic field is northward, the plasma sheet can become convex in the center of the tail which may cause bifurcation of plasma sheet and formation of theta-aurora.
Antonova Elizabeth E.
Ovchinnikov Ilya L.
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