On the origin of UHF atmospherics

Details On the origin of UHF atmospherics On the origin of UHF atmospherics

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..475r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, Apr. 1978, p. 475-478.

Physics

Atmospheric Physics, Atmospherics, Lightning, Microwave Emission, Bremsstrahlung, Radiation Distribution, Ultrahigh Frequencies

Scientific paper

Assuming lightning discharge as a plasma it is shown that bremsstrahlung is a possible source of UHF emissions. The computed power gives a flat frequency response with a magnitude of about 10 to the -15th power W per sq m-Hz at a distance of 1 km from the base of the channel. While partially ionized channels like stepped leader, dart leader and K-changes are the strong source of UHF emissions, the radiation from the return stroke is negligible. Our theoretical results are in excellent agreement with the experimental observations of Book and Kitagawa (1964) and Kosarev et al. (1969, 1970).

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