Tidal Winds in the Lower Ionosphere.

by E. S. Batten


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Presents a description of neutral air motions in the E-layer in which tidal winds have been computed from theory. The effects of dissipation and thermal excitation in the thermosphere are considered. Forms of dissipation include molecular heat conduction and viscosity, turbulence, and ion drag. Thermospheric excitation may be due to heating by absorption of solar radiation, particle precipitation, and dissipative mechanisms. This paper adds the effects of heat conductivity and the absorption of solar radiation in the thermosphere to the existing tidal theory. The results show that dissipation damps the amplitude and increases vertical wavelength of the vertically propagating tidal modes. Thermospheric heating does not significantly increase the amplitudes of the vertically propagating modes in the E-region, but increases the amplitudes of the evanescent modes by as much as a factor of 10 near 140 km.

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