Computer Science
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27...63g&link_type=abstract
Planetary and Space Science, vol. 27, Jan. 1979, p. 63-77.
Computer Science
3
Auroral Zones, Conjugate Points, Geomagnetic Pulsations, Earth Magnetosphere, Polarization (Waves), Ring Currents, Time Dependence
Scientific paper
An analysis is made of giant pulsation (Pg) data recorded at ground stations in the Northern Auroral Zone in Scandanavia (mainly at Tromso, L = 6.4 and Kiruna, L = 5.5) during the period September 1976 to December 1977. They are shown to have a meridional variation of amplitude and polarization consistent with a field line resonance structure and their vertical component behaviour suggests that they also have a rapid azimuthal phase variation. Limited data from conjugate stations at L = 4.4 are used to show that Pg's are odd mode oscillations of the field line. Pg's are equated to the observation of a unique compressional wave in space at synchronous orbit and it is suggested that they result from the drift wave instability of the compressional Alfven wave at the outer edge of the quiet time ring current.
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