Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..243b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Mar.-Apr. 1992, p. 243-250.
Physics
23
Atmospheric Attenuation, Earth-Ionosphere Waveguide, Extremely Low Frequencies, Wave Propagation, Atmospherics, Legendre Functions, Lightning, Nyquist Frequencies
Scientific paper
An instrument system developed for the recording of large amplitude extremely low frequency (ELF) atmospherics or 'events' radiated by lightning in the bands 5-50 Hz is described. The attenuation constant of the earth-ionosphere duct has been deduced from data obtained with the system by modeling the experimentally derived (complex) wave impedance using a numerical optimization algorithm. This algorithm includes a precise evaluation of the Legendre functions of orders 0 and 1 which define the theoretically predicted fields in the earth-ionosphere spherical-shell cavity. The data show that the attenuation rate of ELF fields is considerably greater for signals propagating over polar paths than for signals which have propagated on paths confined to tropical and midlatitude regions. Analysis of the deduced attenuation rate obtained as a function of frequency and arrival azimuth (bearing) has enabled estimation of the variation of the attenuation rate with wave frequency and latitude, for latitudes greater than that of the observing station at 51 deg N. The results provide new empirical information on the variation of the propagation constant of the earth-ionosphere duct with frequency and latitude.
Burke C. P.
Jones Llanwyn D.
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