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|Title:||Simultaneous ground-based and satellite observations of the auroral Ps6 pulsatin — A clue to magnetosphere – ionosphere coupling|
Samson, J C
|Abstract:||A particular event of auroral substorm Ps6 pulsation observed simultaneously on ground- and satellite-based magnetograms is used as a clue to the possibility of electrical coupling between the earth’s magnetosphere and ionosphere. On 16 Mar. 1978, between 1630 and 1730 hrs UT, ground magnetometer array (dipole coordinates 67°N, 298°E) operated by the University of Alberta, Canada, and the ISEE-1 and ISEE-2 satellite magnetometers, recorded Ps6 pulsations with the same periodicity and pattern, with maximum power at the same frequencies (0.375 mHz and 1.125 mHz). Since the Alberta array and the satellites were both located in the local dawn sector, an explanation is given for possible coupling between the two. This current is caused by Kelvin-Helmholtz waves mapping from the interface between the central plasma sheet and the low latitude boundary layer of the magnetosphere to the auroral ionosphere through three-dimensional field-aligned current, and the observed Ps6 pulsation is understood as the magnetic signature of this current.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.19(1) [February 1990]|
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