Physics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9911243v&link_type=abstract
Journal of Geophysical Research, Volume 99, Issue A6, p. 11243-11250
Physics
Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Magnetotail Boundary Layers
Scientific paper
A study is made of some dynamic implications of our earlier model of large-scale magnetospheric structure, in which the plasma sheet is a collisionless shock wave (Fridman and Voronov, 1993). According to our calculations, the polar boundary of the auroral oval always lies equatorward of the boundary of closed and open field lines. An abrupt enhancement of the global magnetospheric convection electric field is immediately followed by a thinning of the plasma sheet, an increase of its plasma density and by the equatorward displacement of the auroral oval polar boundary. With a decrease of the magnetospheric electric field the plasma sheet expands, and the polar boundary of the auroral oval is pulled nearer to the boundary of closed and open field lines. A typical time of change of the plasma sheet configuration in the distant tail is a few minutes, while the time of displacement of the auroral oval polar boundary amounts to several tens of minutes.
Fridman Sergei V.
Voronov Evgenii V.
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