On the origin of UHF atmospherics |
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| Affiliation: | 1. Smart Government Lab, University of St. Gallen, Dufourstrasse 40a, 9000 St. Gallen, Switzerland;2. Department of Politics and Public Administration, University of Konstanz, Universitätsstr. 10, 78464 Konstanz, Germany;1. Department of Business, Management and Strategy, Vrije Universiteit Brussel, Brussels 1050, Belgium;2. Facultad de Economía y Negocios, Universidad del Desarrollo, Santiago, Chile;3. Northumbria Centre for Innovation Regional Transformation and Entrepreneurship (iNCITE), Newcastle Business School, Northumbria University, Newcastle, United Kingdom |
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| Abstract: | 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 10−15 W m−2 Hz−1 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 Kosarevet al. (1969, 1970). |
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