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Tidal waves within the thermosphereThe eigenfunctions of the atmosphere (the Hough functions within the lower atmosphere below about 100 km) change their structure and their propagation characteristics within the thermosphere due to dissipation effects such as heat conduction, viscosity, and ion drag. Wave dissipation can be parameterized to a first-order approximation by a complex frequency, the imaginary term of which simulates an effective ion drag force. It is shown how the equivalent depth, the attenuation, and the vertical wavelength of the predominant symmetric diurnal tidal modes change with height as functions of effective ion drag. The boundary conditions of tidal waves are discussed, and asymptotic solutions for the wave parameters like pressure, density, temperature, and wind generated by a heat input proportional to the mean pressure are given. Finally, diffusion effects upon the minor constituents within the thermosphere are described.
Document ID
19740040931
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Volland, H.
(Bonn, Universitaet Bonn, Germany)
Mayr, H. G.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 7, 2013
Publication Date
February 1, 1974
Subject Category
Geophysics
Accession Number
74A23681
Distribution Limits
Public
Copyright
Other

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