Physics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9518849l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Nov. 1, 1990, p. 18849-18860. Research supported by NSERC.
Physics
1
Current Sheets, Geomagnetic Tail, Space Plasmas, Mass Transfer, Momentum Transfer, Polar Substorms, Steady State
Scientific paper
The role of the plasma mantle in the dynamics of the earth's distant magnetotail is investigated. The plasma mantle can exert a substantial influence on the current-sheet force equilibrium by transporting both momentum and mass from the dayside magnetopause to the tail current sheet. Such influences are particularly strong when the interplanetary magnetic field contains a significant southward component for a prolonged period. It is found that a number of processes characterizing a substorm growth phase can be attributed, at least in part, to the plasma mantle. Among these processes are the thinning of the plasma sheet, storage of magnetic energy in the tail, and formation of plasmoids. The rates of these processes are found to increase nonlinearly with the momentum density of the mantle plasma. The present model applies only to the distant magnetotail because of various approximations that are made to allow an analytical treatment of the governing equations.
Hill Thomas W.
Liu Wende
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