Motion of polar-cap auroral arcs

Details Motion of polar-cap auroral arcs Motion of polar-cap auroral arcs

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ge%26ae..18..744s&link_type=abstract

Geomagnetizm i Aeronomiia, vol. 18, July-Aug. 1978, p. 744, 745. In Russian.

Physics

1

Auroral Arcs, Plasma-Electromagnetic Interaction, Polar Caps, Solar Terrestrial Interactions, Solar Wind, Diurnal Variations, Geomagnetism, Magnetospheric Instability, Northern Hemisphere

Scientific paper

The motion of 117 polar-cap auroral arcs above Resolute Bay (invariant latitude approximately 84 deg) and of 82 such arcs above Vostok station (invariant latitude approximately -84 deg) during several observational periods is examined. It is found that arc motion from the boundaries to the center of the caps predominates in both the Northern and the Southern Hemispheres. This result is shown to be in agreement with previous observations of predominant arc motion from the morning to the evening side of the North Polar Cap. The observed regularity in the motion of polar-cap auroral arcs is explained in terms of solar-wind plasmoids moving across the geomagnetic field on lines of force emanating from the polar caps.

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