Variability of dayside convection and motions of the cusp/cleft aurora

Details Variability of dayside convection and motions of the cusp/cleft aurora Variability of dayside convection and motions of the cusp/cleft aurora

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1011l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 11, p. 1011-1014.

Physics

47

Convective Flow, Earth Ionosphere, Eiscat Radar System (Europe), Plasma Dynamics, Polar Cusps, Daytime, Interplanetary Magnetic Fields, Magnetohydrodynamic Waves, Magnetosphere-Ionosphere Coupling

Scientific paper

We present measurements of the ionospheric plasma flow over the range of invariant latitudes 71-76 deg observed at 10-second resolution using the EISCAT radars with simultaneous observations of the 630 nm cusp/cleft aurora made by a meridian-scanning photometer at Svalbard. A major increase in the transauroral voltage from 5 to 40 kV (associated with sunward convection in the early afternoon sector) is found to follow a southward motion of the aurora, and to coincide with the onset of regular transient auroral breakup events. These observations are consistent with recent theoretical work on how ionospheric flows are excited by time-dependent reconnection at the dayside magnetopause.

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