Mathematics – Probability
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1053t&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 35, Aug. 1987, p. 1053-1059.
Mathematics
Probability
3
Earth Magnetosphere, Ionospheric Propagation, Midlatitude Atmosphere, Very Low Frequencies, Whistlers, Diurnal Variations, Radio Attenuation, Sunrise, Sunset
Scientific paper
Whistler-mode signals were measured at the conjugate point (L = 1.93) in South Australia of the VLF transmitter in Eastern USSR. The intensity of whistler-mode signals increased usually at sunset and occasionally at sunrise, and was moderate during night-time. By means of the calculation of the wave attenuation in the lower ionosphere, the result may be interpreted in terms of different mechanisms of propagation in the magnetosphere and transmission out of the ionosphere: spatially coherent propagation in a field-aligned duct and transmission out of the duct onto the ground at sunset and sunrise; and spatially incoherent propagation and transmission at night. A high correlation was found between the occurrence probability of the 14.881-kHz whistler-mode signals and the occurrence number of whistlers, which may suggest that the occurrence of whistlers is controlled predominantly by propagation conditions.
Hayakawa Masahiko
Nishino Masamichi
Tanaka Yasuhiro
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