Periodic auroral events at the midday polar cap boundary - Implications for solar wind-magnetosphere coupling

Details Periodic auroral events at the midday polar cap boundary - Implications for solar wind-magnetosphere coupling Periodic auroral events at the midday polar cap boundary - Implications for solar wind-magnetosphere coupling

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1223s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 12, June 19, 1992, p. 1223-1226. Research supported by Norwegian Pol

Physics

26

Auroras, Earth Magnetosphere, Interplanetary Magnetic Fields, Solar Terrestrial Interactions, Solar Wind, Energy Transfer, Ground Stations, Magnetic Flux, Magnetopause, Magnetosphere-Ionosphere Coupling, Polar Caps, Satellite Observation

Scientific paper

An interesting observed phenomenon of dayside auroral activity is the periodic sequence of moving bright forms observed at the polar cap boundary during southward-directed interplanetary magnetic field (IMF) conditions. The optical events reported here are elliptical-shaped bright 630.0 nm forms of about 200 km (N-S) x 300-500 km (E-W) spatial extent. They move eastward near the noon meridian with velocities of about 1.5 km/s and repeat at intervals of 5-10 min. Coordinated ground and satellite observations show that these auroral forms slow down and fade out after about 10 min., within the region of mantle precipitation. The present ground observations support the earlier indication that the direction of east-west motion along the polar cap boundary at/near magnetic noon is determined by the IMF B(Y) polarity, consistent with models of field tension on magnetic flux tubes connected with the solar wind. The optical characteristics of the events documented here may have important implications for the nature of magnetic merging at the magnetopause and the associated transfer of energy and momentum to the ionosphere in the cusp/mantle region.

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