Physics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.8941r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Oct. 1, 1984, p. 8941-8948.
Physics
53
Electrojets, Magnetic Storms, Traveling Ionospheric Disturbances, Electron Precipitation, Electron-Ion Recombination, Ion Production Rates, Ionospheric Currents, Propagation Velocity, Surges, Wave Propagation
Scientific paper
A dynamic model for the propagation of the westward travelling surge that can explain the diversity in the observed surge characteristics is developed. The concept of current closure is utilized and incorporated with elements of the Inhester-Baujohann model. The magnitude of the surge velocity and its direction are derived, and the role of electron-ion recombination effects is investigated. It is found that precipitating electrons at the conductivity gradient modify the gradient, causing it to propagate as a wave front. The velocity of propagation depends directly on the ionization efficiency of the precipitating electrons. The direction of the surge motion depends on the presence of polarization charges on the poleward surge boundary. The electron-ion recombination rate modifies the surge velocity, determines the conductivity profile at the boundary, and is responsible for the retreat of the enhanced conductivity region and the associated electrojet during the recovery phase.
Block Lars P.
Rothwell Paul L.
Silevitch Michael B.
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