Plasma flow bursts in the auroral electrojets

Details Plasma flow bursts in the auroral electrojets Plasma flow bursts in the auroral electrojets

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..835w&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 11-12, p. 835-848.

Physics

18

Auroral Electrojets, F Region, Flow Velocity, Magnetohydrodynamic Flow, Earth Magnetosphere, Eiscat Radar System (Europe), Interplanetary Magnetic Fields, Magnetic Field Reconnection, Magnetic Storms

Scientific paper

The F-region ion velocity measured by EISCAT in the auroral electrojets shows rapid variations, characterized by intervals of greatly increased velocity, usually in the same directions as the prevailing velocity associated with magnetospheric convection. These bursts of enhanced plasma velocity may be either short-lived but spread over several degrees of latitude and longitude, or relatively long-lived but narrow in extent and associated with auroral features drifting through the EISCAT beam. It is suggested that the short-lived widespread events are driven directly by magnetic reconnection at the dayside magnetopause or they are associated with reconnection on the nightside during the expansion phase of a substorm. Several examples are shown where the interplanetary magnetic field remains southward for several hours but the plasma velocity measured by EISCAT is dominated by a series of bursts.

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