Accession Number : ADA180270

Title :   Pi2 Pulsations and the Westward Traveling Surge in the Magnetosphere - Ionosphere Coupling.

Descriptive Note : Final rept. 15 Nov 85-30 Sep 86,

Corporate Author : ALASKA UNIV FAIRBANKS GEOPHYSICAL INST

Personal Author(s) : Kan,J R

PDF Url : ADA180270

Report Date : Nov 1986

Pagination or Media Count : 25

Abstract : 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 km/sec westward and less than 1 km/sec 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.

Descriptors :   *TRAVELING WAVES, *IONOSPHERIC DISTURBANCES, COUPLING(INTERACTION), DYNAMICS, IONOSPHERE, MAGNETOSPHERE, OSCILLATION, RECOMBINATION REACTIONS, SCALE, SURGES, TIME, VARIABLES, VELOCITY, ELECTRICAL CONDUCTIVITY, CONVECTION(ATMOSPHERIC)

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE