Physics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212187r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12187-12201. NSERC-supported research.
Physics
108
Boundary Layers, Earth Magnetosphere, Geomagnetic Tail, Magnetic Storms, Magnetohydrodynamic Flow, Solar Terrestrial Interactions, Field Aligned Currents, Kelvin-Helmholtz Instability, Magnetic Fields, Perturbation Theory, Solar Wind
Scientific paper
An alternative framework for understanding magnetospheric substorm activity is presented. It is argued that observations of magnetic field and plasma flow variations in the magnetotail can be explained in terms of the passage of the plasma sheet boundary layer over the satellite detecting the tail signatures. It is shown that field-aligned currents and particle acceleration processes on magnetic field lines threading the ionospheric Harang discontinuity lead to the distinctive particle and field signatures observed in the magnetotail during substorms. It is demonstrated that edge effects of field-aligned currents associated with the westward traveling surge can lead to the negative B(z) perturbations observed in the tail that are presently attributed to observations made on the anti-earthward side of a near-earth neutral line. Finally, it is shown that the model can provide a physical explanation of both the driven system and the loading-unloading system whose combined effects provide the observed substorm perturbation pattern in the magnetosphere and ionosphere.
Eastman Tim
Rostoker Gordon
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