Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9712173f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A8, Aug. 1, 1992, p. 12,173-12,185. Research supported by SERC, N
Physics
17
Auroras, E Region, Ionospheric Drift, Magnetic Storms, Radar Measurement, Convection, Drift Rate
Scientific paper
A recurrent convection signature observed in the E region ionosphere within about 2 hr of the dusk meridian by the SABRE radar facility is reported. In a typical event, the irregularlity drift speed in the SABRE field of view is seen to increase from about 300 m/s to of the order of 1 km/s in the space of about 10 min. The speed subsequently remains at the enhanced level for 10 min or longer before declining as rapidly as its onset. The total event duration ranges between 30 min and 1 hr. As the irregularlity drift speed increases the direction of the drift velocity changes, rotating poleward. Simultaneously, the radar backscatter power decreases. It is suggested that the events are part of the magnetospheric response to the onset of a geomagnetic substorm. The speed at which the substorm-initiated ionospheric flow enhancement moves from the nightside is estimated to be 1-4 km/s. It is argued that these events are distinct from westward traveling surges and appear to differ from the midlatitude phenomenon of subauroral ion drifts.
Freeman Mervyn. P.
Lester Mark
Reeves Geoff D.
Southwood David J.
Yeoman Timothy K.
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