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ELF Attenuation Rates and Phase Velocities Observed From Slow‐Tail Components of Atmospherics
Author(s) -
Taylor W. L.,
Sao K.
Publication year - 1970
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs005i012p01453
Subject(s) - atmospherics , attenuation , amplitude , phase (matter) , phase velocity , physics , optics , wave propagation , geology , meteorology , quantum mechanics
Slow‐tail portions of atmospherics were recorded simultaneously in Japan and the United States from sources located in the Pacific Ocean area. The amplitude and phase spectra of forty pairs of selected atmospherics were computed, and propagation parameters for the zero‐order wave‐guide mode were calculated for nighttime conditions only. Attenuation rates for W‐E propagation extended from about 0.5 db/Mm at 20 Hz to 2.0 db/Mm at 300 Hz and for E‐W propagation from 0.8 db/Mm at 20 Hz to about 2.8 db/Mm at 300 Hz. The phase velocities extended from about 0.7 and 0.8 the velocity of light for W‐E and E‐W propagation, respectively, at 20 Hz to about 0.93 the velocity of light for either direction at 300 Hz.