Physics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979esasp.148..387v&link_type=abstract
In ESA Magnetospheric Boundary Layers p 387-393 (SEE N80-13529 04-42)
Physics
4
Boundary Layer Plasmas, Earth Magnetosphere, Ionospheric Currents, Birkeland Currents, Boundary Layer Flow, Convection Currents, Field Aligned Currents, Lines Of Force, Magnetohydrodynamic Generators, Magnetosheath, Magnetosphere-Ionosphere Coupling, Pressure Gradients, Ring Currents
Scientific paper
The high latitude ionosphere is connected by magnetic field lines to the various observed magnetospheric boundary layers as well as (via open magnetic field lines) to the magnetosheath. The electrodynamic interaction between the ionosphere and the boundary regions is governed by the same self consistent chain of equations as the ionosphere magnetosphere interaction at lower latitudes. The plasma flow in the boundary region interacts with the ionosphere analogously to an MHD dynamo. In response to the imposed electric fields, field aligned (Birkeland) currents flow into and out of the ionosphere. The theoretically deduced pattern of these Birkeland currents is qualitatively similar to their observed pattern. Pressure gradients within the ring current region interact, via ionospheric closure of their associated Birkeland currents, with the magnetosphere ionosphere MHD dynamo driven by boundary region flow.
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