The nocturnal D-region as seen by VLF radio waves

Details The nocturnal D-region as seen by VLF radio waves The nocturnal D-region as seen by VLF radio waves

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..407b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, May 1982, p. 407-413.

Physics

D Region, Field Strength, Ionospheric Propagation, Night Sky, Radio Transmitters, Very Low Frequencies, Atmospheric Models, Ionospheric Electron Density, Nocturnal Variations, Propagation Modes, Solar Activity Effects, Sunspots

Scientific paper

On the night of 29 July 1976, measurements were made in New Zealand of the field strength of a transportable VLF transmitter at a series of distances, for frequencies of 7.27 and 8.68 kHz. Using waveguide mode theory, theoretical computations of transmitter field strength have been made, for propagation under a series of model ionospheres, to compare with these experimental data. In order to accurately fit the data it is found that nocturnal ionosphere models with a sharp cut-off in electron density in the region of 88 km are required. Although the experiment was performed in the southern hemisphere winter, at a sunspot minimum, it was found that out of the three nocturnal electron density models studied (Deeks, 1966) the profile for summer and sunspot maximum conditions gave best fit to the data.

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