Coordinated observations with EISCAT and the Viking satellite - The decay of a westward travelling surge

Details Coordinated observations with EISCAT and the Viking satellite - The decay of a westward travelling surge Coordinated observations with EISCAT and the Viking satellite - The decay of a westward travelling surge

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..479o&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 7, Oct. 1989, p. 479-499. Research supported by NSERC and Naturvetenskapliga Forsknin

Computer Science

Sound

14

Eiscat Radar System (Europe), Esa Spacecraft, Satellite Sounding, Traveling Ionospheric Disturbances, Ionospheric Storms, Magnetic Storms, Swedish Space Program

Scientific paper

The instrumentation and the orbit of the Viking satellite made this first Swedish satellite mission ideally suited for coordinated observations with the dense network of ground-based stations in northern Scandinavia. Several arrays of complementing instruments such as magnetometers, all-sky cameras, riometers, and Doppler radars monitored on a routine basis the ionosphere under the magnetospheric region through which Viking passed. For a large number of orbits the Viking passages close to Scandinavia were covered by the operation of specially designed programs of the European Incoherent SCATter facility (EISCAT). First results of coordinated observations on the ground and aboard Viking have shed new light on the most spectacular feature of substorm expansion, the westward traveling surge. As an example study, the end of a substorm and the associated decay of a westward traveling surge (WTS) have been analyzed. It was found that a WTS can be maintained stationary for as long as the disturbance, caused by the westward substorm electrojet, is recovering. Physically, a stationary substorm surge does not seem to differ from the expansion phase WTS.

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