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Theoretical aspects of tidal and planetary wave propagation at thermospheric heightsA simple semiquantitative model is presented which allows analytic solutions of tidal and planetary wave propagation at thermospheric heights. This model is based on perturbation approximation and mode separation. The effects of viscosity and heat conduction are parameterized by Rayleigh friction and Newtonian cooling. Because of this simplicity, one gains a clear physical insight into basic features of atmospheric wave propagation. In particular, we discuss the meridional structures of pressure and horizontal wind (the solutions of Laplace's equation) and their modification due to dissipative effects at thermospheric heights. Furthermore, we solve the equations governing the height structure of the wave modes and arrive at a very simple asymptotic solution valid in the upper part of the thermosphere. That 'system transfer function' of the thermosphere allows one to estimate immediately the reaction of the thermospheric wave mode parameters such as pressure, temperature, and winds to an external heat source of arbitrary temporal and spatial distribution. Finally, the diffusion effects of the minor constituents due to the global wind circulation are discussed, and some results of numerical calculations are presented.
Document ID
19770051551
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 9, 2013
Publication Date
May 1, 1977
Publication Information
Publication: Reviews of Geophysics and Space Physics
Volume: 15
Subject Category
Geophysics
Accession Number
77A34403
Distribution Limits
Public
Copyright
Other

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