Pi2 Pulsations and the Westward Traveling Surge in the Magnetosphere - Ionosphere Coupling.
Final rept. 15 Nov 85-30 Sep 86,
ALASKA UNIV FAIRBANKS GEOPHYSICAL INST
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The dynamics of the westward travelling surge WTS is studied in a magnetosphere-ionosphere coupling model. It is shown that the motion of the WTS is governed by the combined effects of the magnetospheric Alfven time scale and the ionospheric recombination time scale. The surge is found to move at variable speeds the speed is around 6 kmsec westward and less than 1 kmsec northward near the onset of the surge thereafter, it oscillates irregularly and decreases toward zero. The polar cap potential difference is found to oscillate irregularly as it increases toward the enhanced convection level. The irregular oscillations found in our results are believed to be a general property of mulit-time-scale problems. Keywords Westward traveling surge Alfven waves Magnetosphere ionosphere coupling Conductivity profiles.
- Atmospheric Physics