Physics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4729r&link_type=abstract
Journal of Geophysical Research, vol. 80, Dec. 1, 1975, p. 4729-4731.
Physics
1
Earth Magnetosphere, Ionospheric Propagation, Wave Reflection, Whistlers, Magnetospheric Proton Density, Propagation Modes, Ray Tracing, Wave Packets
Scientific paper
Propagation paths of subprotonospheric (SP) whistlers are studied on the basis of Ogo 4 satellite data and ray tracing. SP whistler components picked up at a point in the ionosphere are associated with wave packets entering the lower ionosphere at different latitudes and traversing different paths. Reflection of a downcoming SP whistler component near the ion cutoff frequency is accompanied by a tone whose frequency increases with time. Horizontal gradients in the ionosphere are shown to play a major role in reflection of ELF waves at heights of about 1000 km. The combination of SP whistler and rising-tone component is examined as a possible useful diagnostic probe of the plasma structure of the ionosphere.
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