Computer Science
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38.1555m&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, Dec. 1990, p. 1555-1561, 1563-1565.
Computer Science
6
Geomagnetic Micropulsations, Geomagnetism, Hiss, Very Low Frequencies, Vlf Emission Recorders, Antarctic Regions, Earth Magnetosphere, Extremely Low Radio Frequencies, Lagrangian Equilibrium Points, Plasmapause
Scientific paper
The first observations are presented from Halley, Antarctica, of quasi-periodic (QP) VLF intensity variations modulated at the frequency of concurrent Pc3 magnetic pulsations. Seen on broadband frequency-time plots, the QP emissions are of both the dispersive and non-dispersive types. From the frequency and phase variation with time of the QP emissions and magnetic pulsations, estimates are obtained of the travel times of the ULF waves from the interaction region to the ground. The observations appear consistent with the idea of modulation of a pre-existing VLF hiss source in the magnetosphere by the compressional components of ULF waves. A significant change in the travel time during one event is consistent with a crossing of the plasmapause by the Halley fieldline.
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