Computer Science – Sound
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm62a08g&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM62A-08
Computer Science
Sound
2730 Magnetosphere--Inner, 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms
Scientific paper
Polarization Jet (PJ) is a narrow (sim 50-200 km) band of supersonic westward drift of ionospheric plasma along the nightside boundary of large-scale convection. PJ (or, SAID) appears at low and moderate activity levels, usually after a burst of AE-index. Recent ground-based data from oblique ionospheric sounders at L=3 in Yakutia, Russian Federation, revealed delays of the overhead PJ development after an AE-burst as short as 10 minutes and less, accompanied by a rapid westward shift of the Harang Discontinuity (HD). A simplified quantitative model is constructed of the plasma convection westward from the near-midnight injection region. The model successfully describes all the observed average PJ characteristics: its width, bell-shape electric field, time duration, MLT extent, etc. The dynamic PJ formation stage is considered only qualitatively, but its duration and associated HD westward shift are shown to be consistent with the proposed model. Some observable tests of the model and its consequences for the PJ-related weak SAR-arc are discussed.
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