Auroral boundary dynamics observed simultaneously from the Viking spacecraft and from the ground

Details Auroral boundary dynamics observed simultaneously from the Viking spacecraft and from the ground Auroral boundary dynamics observed simultaneously from the Viking spacecraft and from the ground

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.5845s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 5845-5865. Research supported by NSERC and National R

Physics

Space Physics

6

Auroral Arcs, Magnetic Storms, Satellite Imagery, Ultraviolet Photography, Satellite Observation, Spatial Resolution, Temporal Resolution, Viking Spacecraft

Scientific paper

The ultraviolet imager on the Viking spacecraft gives global information on the activity of the auroral distribution. The ground-based optical facility at the Swedish Institude of Space Physics, in Kiruna, Sweden, gives information on the finer-scale auroral structure. Simultaneous satellite- and ground-based measurements using this instrumentation were obtained for three selected events during the spring of 1986. For some aspects, a remarkable correspondence of particular features observed from space and from the ground is found. For others the different views are complementary in nature. Taken together, they provide a comprehensive picture of presubstorm, substorm, and postsubstorm dynamics. The major findings include a narrow active rayed arc set within a background of softer precipitation that defines what is generally called the 'diffuse' aurora, with repeated fading on the time scale of 5 min, and a period of rapid convection manifested by the disappearance of transpolar arcs and the onset of undulations of the poleward boundary arc observed well before substorm onset.

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