Experimental daytime VLF ionospheric parameters

Details Experimental daytime VLF ionospheric parameters Experimental daytime VLF ionospheric parameters

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55..173t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 2, p. 173-184.

Physics

38

Daytime, Field Strength, Ionospheric Propagation, Solar Position, Very Low Frequencies, Computer Programs, Computerized Simulation, Measuring Instruments, Precision

Scientific paper

The paper uses measured field strengths from VLF transmitters to determine improved daytime values of ionospheric parameters to enable improved VLF propagation predictions. These parameters are the traditional H-prime (height in km) and beta (sharpness in per km) as used by Wait (1967) and the Naval Ocean Systems Center in their earth-ionosphere waveguide computer program. Experimental observations from two nearly north-south paths are used to determine the solar zenith angle dependence of both H-prime and beta for low latitude conditions. These results are employed to predict the daytime variations in VLF field strengths with solar zenith angle on other suitable paths, and good agreement is found with measurements made on these paths. The absolute value for beta for overhead sun is found to be 0.45/km.

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