Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..399r&link_type=abstract
In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 399-403 (SEE N85-24544 14-46)
Physics
Auroral Electrojets, Dynamic Models, Magnetic Storms, Traveling Ionospheric Disturbances, Electron Precipitation, Electron-Ion Recombination, Field Aligned Currents, Ionospheric Conductivity, Ionospheric Propagation, Sudden Storm Commencements
Scientific paper
A unified model for the propagation of the Westward Traveling Surge (WTS) which can explain the diversity in the observed surge characteristics is developed. The direction of the surge motion depends on the presence of polarization charges on the poleward boundary. This is related to the efficiency with which the poleward ionospheric currents are closed off into the magnetosphere by the field aligned currents. Inclusion of the electron ion recombination rate modifies the surge propagation velocity and leads to explicit expressions for the conductivity profile. Sufficient precipitation current is required to overcome electron ion recombination in order for the surge to expand. When the precipitating current is less than this threshold the WTS retreats. The model describes the ionospheric response to the expansion and recovery phases of the magnetic substorm.
Block Lars P.
Rothwell Paul L.
Silevitch Michael B.
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