Physics
Scientific paper
Jun 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..435h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 6, pp. 435-450
Physics
Scientific paper
The amplitude of very low frequency radio waves has been observed at distances up to 2000 km from the transmitter with the main emphasis on the diurnal variations at ranges of 1000 km. An interpretation is attempted of these observations, and also of earlier short-range work, in terms of a model of the ionosphere which assumes a sharp lower boundary. It is found that this model cannot explain the details of the observations and there is evidence for the more complex structure already suggested by other workers. This involves ionization at lower levels throughout the summer day and also a transitory layer at sunrise in all seasons.
Hargreaves John Keith
Roberts RG
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