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De Keyser 1999
De Keyser, J. (1999). Formation and evolution of subauroral ion drifts in the course of a substorm. Journal of Geophysical Research 104: doi: 10.1029/1999JA900109. issn: 0148-0227.

We propose a physical mechanism that explains how polarization jets (PJ) or subauroral ion drifts (SAID) are formed in the course of a substorm and how they evolve. A PJ/SAID is considered to be the ionospheric signature of an inward moving injected plasma front. The flow shear that exists across this interface when it arrives in the vicinity of the plasmapause is responsible for the generation of intense electric fields in the premidnight sector, where PJ/SAID are observed. Quantitative simulation of this mechanism accounts for PJ/SAID width and peak drift velocity. The mechanism explains why PJ/SAID are observed poleward of or in the vicinity of the plasmapause. The inward traveling time of the injected plasma agrees with the delay between substorm onset and the apparition of PJ/SAID; the evolution of the ionospheric signature is consistent with observations as well. ¿ 1999 American Geophysical Union

BACKGROUND DATA FILES

Abstract

Keywords
Space Plasma Physics, Discontinuities, Magnetospheric Physics, Storms and substorms, Magnetospheric Physics, Electric fields, Magnetospheric Physics, Magnetosphere/ionosphere interactions, Ionosphere, Current systems, Magnetospheric Physics, MHD waves and instabilities
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
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