Short-term dynamics of the high-latitude auroral distribution

Details Short-term dynamics of the high-latitude auroral distribution Short-term dynamics of the high-latitude auroral distribution

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.6969m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, June 1, 1989, p. 6969-6974. Research supported by NSERC.

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13

Auroral Arcs, Northern Hemisphere, Polar Regions, Satellite Imagery, Ultraviolet Photography, Viking Orbiter Spacecraft, Interplanetary Magnetic Fields, Lyman Spectra, Morphology

Scientific paper

During two consecutive orbits of the Viking satellite on March 24, 1986, UV observations of the Northern Hemisphere auroral distribution revealed rapid growth and decay of large-scale polar arcs. Evolution of these features occurred from the nightside auroral distribution toward the dayside. The connection on the dayside was short-lived (about 2 min) and the arc retreated at similar speeds to its development (about 5 km/s). Examples of arc occurrences during a half-hour time period show that arcs can extend from the nightside to the dayside and disappear, and another extended arc can appear at a widely separated position. These types of dynamic polar features appear consistent with the dynamic energization and precipitation of boundary layer electrons at high latitudes.

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