Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9614009l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 1, 1991, p. 14,009-14,022.
Physics
55
Field Aligned Currents, Magnetohydrodynamic Waves, Magnetopause, Statistical Analysis, Vertical Distribution, Current Density, Magnetic Recording
Scientific paper
A computer algorithm is described which selects large, short-lived magnetic-impulse events from magnetic records. The magnetic records were taken from near-cusp-latitude conjugate stations, and only magnetic fields with vertical components of 50 nT or more lasting 6-12 min are isolated by the computer method. For both stations, the events occur primarily between 06 and 18 LT with notable lows at 11 LT. A half-cycle, odd-mode Alfven wave along a near-magnetopause flux tube generates the events, and the associated vertical magnetic deflections are utilized to determine the directions of field-aligned currents. The currents point into the ionosphere in the morning-LT sector and away from the ionosphere in the afternoon-LT sector. The vertical components's average deflection is about 95 nT and the magnitude of the average field-aligned currents is about 2 x 10 to the -7th A/sq m. The results suggest that Iqualit and South Pole have a higher effective magnetic latitude during the impulse events.
Konik Robert M.
Lanzerotti Louis J.
Maclennan Carol G.
Venkatesan D.
Wolfe Arthur
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