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- W2024701872 abstract "A phase velocity dispersion study of lower F-region ionospheric waves, in the 10–100 min period range, has shown that the horizontal phase velocity varies approximately as the inverse square root of the period, a relationship which implies that horizontal group velocity is twice phase velocity at all periods. Horizontal phase velocity, at any one wave period, increases an order of magnitude from day to night. The vertical phase velocity increases with altitude causing steeper wavefront tilts at higher elevations. Although some of the observed wave characteristics can be explained by the widely accepted internal gravity wave hypothesis, other characteristics appear difficult to explain by a gravity wave mechanism. An alternative explanation is suggested in terms of electromagnetic waves in the ionosphere for which phase velocity dispersion is expressed by V (cm/sec) = 1√σ(e.m.u.)T−12 (sec). This latter hypothesis, which requires ionospheric electrical conductivities (σ) several orders of magnitude greater than commonly accepted, is nevertheless attractive in that it explains the dispersion and diurnal variation of velocity in a simple and direct manner." @default.
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- W2024701872 title "Phase velocity dispersion of F-region waves" @default.
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- W2024701872 doi "https://doi.org/10.1016/0021-9169(73)90219-5" @default.
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