Physics
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1719n&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 16, p. 1719-1722.
Physics
28
Auroral Arcs, Earth Ionosphere, Flow Velocity, Flux Transfer Events, Magnetosheath, Polar Caps, Daytime, Interplanetary Magnetic Fields, Polar Cusps
Scientific paper
It is proposed that ionospheric flow transients are directly driven by changes in the magnetosheath flows and fields. An increase in the sheath B(y) component drives faster flows eastward or westward, while a decrease in the magnitude of B(y) leads to a transient propagating largely poleward. It is argued that azimuthal flow velocity changes in the ionosphere do not intrinsically imply any change in the merging rate. Changing the merging rate simply alters the number of field lines which are executing the same sequence of motions. Auroral transients frequently convect through the preexisting optical cusp. It is because of the variability in the sheath parameters that variability in ionospheric convection is imposed. The sources of such sheath field variability include intrinsic IMF variations, variations created at the bowshock, and compression of the sheath field by a variable plasma pressure.
Newell Patrick T.
Sibeck David G.
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