Physics
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59..231v&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 231-235.
Physics
Scientific paper
It is considered that a part of the polar cap, adjacent to the auroral oval, lies on closed magnetic field lines. This has found a reasonable explanation in the framework of a model of the plasma sheet as a collisionless shock wave (Fridman and Voronov, 1993, J. geophys. Res. A98, 143-151). According to the model, the polar cap can exist even if all of its magnetic field lines intersect the plasma sheet. The global magnetospheric electric field controls the dynamics of the auroral oval polar boundary. An abrupt enhancement of the global magnetospheric convection electric field is followed immediately by a thinning of the plasma sheet and by an equatorward displacement of the boundary. With a decrease of the magnetospheric electric field, the boundary moves toward the cusp. Whether the electric field increases or decreases, the local auroral formations inside the auroral oval move equatorward with respect to the Earth.
Fridman Sergei V.
Voronov Evgenii V.
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