Dynamical auroral structure in the vicinity of the polar cusp - Multipoint observations during southward and northward IMF

Details Dynamical auroral structure in the vicinity of the polar cusp - Multipoint observations during southward and northward IMF Dynamical auroral structure in the vicinity of the polar cusp - Multipoint observations during southward and northward IMF

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..483s&link_type=abstract

(European Geophysical Society, General Assembly, 16th, Wiesbaden, Germany, Apr. 22-26, 1991) Annales Geophysicae (ISSN 0992-7689

Physics

23

Auroras, Interplanetary Magnetic Fields, Magnetosphere-Ionosphere Coupling, Polar Cusps, Solar Terrestrial Interactions, Field Aligned Currents, Flux Transfer Events, Ionospheric Drift

Scientific paper

Two categories of auroral activity/structure in the vicinity of the polar cusp are discussed on the basis of combined ground and satellite data. In one case, the quasi-period sequence of auroral events at the polar cap boundary involves accelerated electrons moving poleward and azimuthally along the persistent cusp/cleft arc poleward boundary with velocities, comparable to the local ionospheric ion drift during periods of southward IMF. The question of whether or not the optical events signify a corresponding plasma flow across the open/closed field line boundary in such cases is addressed. Near-simultaneous observations of magnetopause flux transfer events and such optical/ion drift events are reported. The reverse pattern of motion of discrete auroral forms is observed during positive IMF BZ, i.e., equatorward motion into the cusp/cleft background arc from the poleward edge. It is suggested that, in both cases, the discrete auroral forms represent temporal/spatial structure of larger-scale convection over the polar magnetosphere.

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