Physics
Scientific paper
Nov 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964jatp...26.1015c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 26, no. 11, pp. 1015-1016, IN1, 1017-1046
Physics
1
Scientific paper
Simultaneous observations of atmospherics made at five European stations during the I.G.Y. are described. Frequency analysis of the waveforms has enabled relative values of night-time attenuation coefficients in the range 1 to 15 kc/s to be calculated. These values are compared with other experimental results and with the waveguide theory. The effect of the relative proportions of land and sea paths is discussed. The experimental results show a subsidiary minimum of attenuation at about 6-8 kc/s, and this is supported by the spectra of very distant atmospherics. The coefficients were used to extrapolate the spectra back to unit distance, the results supporting the hypothesis of a wide range of source currents whose mean is given approximately by I = I0(e-[alpha]t - e-[beta]t), where I0 = 22 kA, [alpha] = 1 × 104sec-1 and [beta] = 5 × 105 sec-1. Finally the location of stations for future studies of v.l.f. attenuation using atmospherics is discussed.
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