Computer Science
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..429r&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 35, April 1987, p. 429-438. NSERC-supported research.
Computer Science
34
Auroral Zones, Daytime, Geomagnetic Micropulsations, Polarization Characteristics, Earth Magnetosphere, Interplanetary Magnetic Fields, Kelvin-Helmholtz Instability, Magnetohydrodynamic Waves, Sunrise, Sunset
Scientific paper
This study presents a comprehensive analysis of the polarization characteristics of Pc5 pulsations using data from a meridian line of magnetometers straddling the auroral oval in the afternoon and dusk sectors. It is found that the latitudinal variation of the polarization characteristics is inconsistent with a simple Kelvin-Helmholtz instability hypothesis, particularly in the local time interval between noon and dusk. It is also found that afternoon sector Pc5 pulsations are a rather rare phenomenon compared to their morning sector counterparts. The afternoon sector events seem to have a tendency to occur during episodes of northward interplanetary magnetic field and, in general, appear to be triggered by impulses which have global signatures at times of quiescence or decreasing magnetospheric activity. It is suggested that, in contrast to morning sector Pc5 activity which appears to originate through the action of a Kelvin-Helmholtz instability at the interface between the low-latitude boundary layer and central plasma sheet, afternoon sector Pc5 events originate as compressional effects with some of the associated energy being coupled into the shear Alfven mode.
Rostoker Gordon
Sullivan Brian T.
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