Physics
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jatp...37..531m&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 37, Mar. 1975, p. 531-543.
Physics
3
Earth Magnetosphere, Ionospheric Propagation, Radio Signals, Solar Activity Effects, Transequatorial Propagation, Whistlers, Annual Variations, Doppler Effect, Magnetic Storms, Magnetoionics, Magnetosphere-Ionosphere Coupling, Nocturnal Variations, Signal Reception, Temperate Regions
Scientific paper
Results of eight years of measurements on whistler-mode signals from station NLK (18.6 kHz) propagating in the vicinity of L = 2.5 are presented. The statistics of occurrence indicate a considerable extent (at least 6000 km) for the longitudinal window within which it is assumed ducts must be if a signal is to be received at a particular station. A significant increase in signal amplitude 2-3 days after a magnetic storm is found. A consistent pattern is found in the nightly variations of doppler shift, but there is a marked difference between the June and December solstice data. The magnitudes of the shifts are comparable with those expected from Sq electric fields, but there is little agreement between the predicted and observed variations of doppler shift. This may be related to ionosphere-magnetosphere coupling fluxes.
Andrews M. K.
McNeill F. A.
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