Computer Science
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..973l&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, Aug. 1990, p. 973-993. Research supported by the Norsk Polarinstitutt and
Computer Science
21
Auroral Ionization, Magnetic Field Reconnection, Magnetohydrodynamic Flow, Plasma Currents, Plasma Flux Measurement, Auroral Zones, Ion Temperature, Magnetopause, Noon, Plasma Dynamics, Transient Oscillations
Scientific paper
Ground-based observations are made of a transient event in the dayside auroral ionosphere at magnetic noon consisting mainly of 630 nm emissions but with short-lived intense 557.7 nm arc fragments accompanied by a marked ion flow signature. At this time, the probabilities for observing the cusp only, the cleft only, and the cusp poleward of the cleft are 0.43, 0.265, and 0.245, respectively. The event is discussed in terms of theories predicting transients in either the cusp or the cleft or both. F-region plasma convection measurements are made by EISCAT radar operating on the polar experiment mode while simultaneous dayside auroral emissions are made by optical meridian-scanning photometers and all-sky TV cameras at Ny Alesund, Spitzbergen. Flow data before and after optical transient are presented and analyzed and color contours of ion temperature derived assuming a Maxwellian ion velocity distribution as well as of ion temperature derived from EISCAT plasma flow observations are presented.
Cowley Stan W. H.
Farmer Dean A.
Lockwood Marian
Lybekk Bjørn
Sandholt Per Even
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