Physics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980p%26ss...28..363h&link_type=abstract
Planetary and Space Science, vol. 28, Apr. 1980, p. 363-374.
Physics
1
Current Sheets, Geomagnetic Tail, Magnetospheric Instability, Plasma Currents, Plasma Dynamics, Magnetic Storms, Magnetohydrodynamic Waves, Wave Propagation, Wave Reflection
Scientific paper
A conceptual model of the formation of the plasma sheet and of its dynamical behavior in association with magnetospheric substorms is proposed. The two essential assumptions of the model are that (1) the plasma mantle is the primary source of plasma-sheet particles and (2) the momentum tends to inhibit the rate of magnetic field annihilation (merging) in the tail current sheet. It is found that there exists no steady state configuration for the plasma sheet, which must instead shrink continuously in thickness until the near-earth portion of the current sheet is disrupted by the formation of a magnetic neutral line. The thinning of the plasma sheet and the resulting current-sheet disruption are proposed to be the direct causes of the growth phase and expansion phase, respectively, of substorms.
Hill Thomas W.
Reiff Patricia H.
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