Physics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..417p&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 42, May 1980, p. 417-425. Research sponsored by the U.S. Defense Nuclear A
Physics
3
Atmospheric Effects, Extremely Low Radio Frequencies, Ionospheric Disturbances, Ionospheric Propagation, Night Sky, Sporadic E Layer, Atmospheric Attenuation, Radio Signals, Radio Transmission, Scattering Functions, Signal Detection
Scientific paper
A simple surface propagation model coupled with a moments method has been used to estimate the effect of a patch of sporadic-E on propagation in the lower ELF band. The results indicate that a sporadic-E patch of 1 Mm by 1 Mm which causes phase rate shifts and attenuation rate enhancements consistent with full wave modal evaluations can account for 6-8 dB fades observed in connection with 1.6 Mm Wisconsin Test Facility (WTF) transmissions. Patches 1 Mm by 0.5 Mm can account for more commonly observed fades in the 3-4 dB range. Deepest fades require the center of the disturbance to be well within the first Fresnel zone. The 1 Mm by 1 Mm patch can produce 2-4 dB fades out to ranges of 10 Mm and more even with the disturbance considerably removed from the terminals of the path.
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