Dayside auroral intensifications during an auroral substorm

Details Dayside auroral intensifications during an auroral substorm Dayside auroral intensifications during an auroral substorm

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..415l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 415-418. Navy-NSERC-supported research.

Physics

32

Auroras, Luminous Intensity, Polar Substorms, Satellite Imagery, Kelvin-Helmholtz Instability, Ultraviolet Photography

Scientific paper

Variations in the dayside and nightside auroral luminosity during the substorm activity on October 15, 1986 are examined using images obtained by the UV imager on board the Viking spacecraft. It is observed that the intensity and dynamic behavior of the localized auroral emissions around the 14 MLT sector can be comparable to that found for nightside discrete arc structure seen during auroral-breakup conditions. Spatial periodicities in luminosity are observed in both the dayside and nightside auroral oval during substorm activity with the azimuthal separation between bright spots on the dayside being approximately 1.5 h of MLT in the post-noon quadrant, and approximately 0.5 h of MLT in the midnight sector. It is suggested that such features could be a manifestation of a Kelvin-Helmholtz instability located at the sites of a velocity shear zone.

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