Physics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..613r&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, March 20, 1992, p. 613-616. Research supported by NSERC.
Physics
9
Auroras, Earth Ionosphere, Geomagnetic Pulsations, Kelvin-Helmholtz Instability, Viking Spacecraft, Earth Magnetosphere, Geomagnetic Tail, Surges
Scientific paper
Preliminary studies of Viking imager data by Lui et al. (1987) have revealed the presence, on occasion, of bright auroral structures periodically arrayed along the auroral oval in the postnoon quadrant. It was suggested that these auroral forms reflect the action of a Kelvin-Helmholtz instability. The results of such a study of periodically arrayed auroral structures with concurrent ULF pulsations are reported. Assuming a common origin of the two phenomena to be the Kelvin-Helmholtz instability, quantitative estimates of some key physical properties of the source region for the ULF and auroral disturbances are made. The observation of a westward traveling surge in the vicinity of 18 MLT is reported and argued on the basis of the mapping factor from the ionosphere to the magnetotail of why surges closer to midnight do not appear to exhibit a significant westward propagation velocity.
Arnoldy Roger L.
Jackel Brian
Rostoker Gordon
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