Observations of distortions of optical features in the UV auroral distribution

Details Observations of distortions of optical features in the UV auroral distribution Observations of distortions of optical features in the UV auroral distribution

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989itps...17..109m&link_type=abstract

IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. 17, April 1989, p. 109-115. Research supported by NSERC and Swedish B

Computer Science

Sound

12

Auroras, Earth Magnetosphere, Kelvin-Helmholtz Instability, Magnetic Variations, Satellite Sounding, Vortex Streets, Cassegrain Optics, Charge Coupled Devices, Northern Hemisphere, Satellite-Borne Instruments

Scientific paper

Observations made by the Viking satellite have for the first time shown the development of multiple large-scale surge features. The longer time scale of these features is contrasted with smaller-scale vortex streets found along the poleward edge of the evening oval, which are generally observed to exist for less than 2 min. The ratio of wavelength to diameter in these features is shown to decrease with increasing wavelength. These observations support the view that the larger surge features are the result of Kelvin-Helmholtz-type instabilities, originating further out in the magnetosphere than their vortex-street counterparts. Observations of spiral features have been made at all local times, and the spirals always have a counterclockwise sense (viewed in the direction of the magnetic field in the Northern Hemisphere). One interpretation of these events is that they are the result of an exponential growth along a field line of an initial upward field-aligned-current perturbation.

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