Theoretical aspects of tidal and planetary wave propagation at thermospheric heights

Details Theoretical aspects of tidal and planetary wave propagation at thermospheric heights Theoretical aspects of tidal and planetary wave propagation at thermospheric heights

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rvgsp..15..203v&link_type=abstract

Reviews of Geophysics and Space Physics, vol. 15, May 1977, p. 203-226.

Physics

Space Physics

6

Atmospheric Models, Atmospheric Tides, Rossby Regimes, Thermosphere, Wave Propagation, Asymptotic Methods, Atmospheric Diffusion, Eigenvalues, Perturbation Theory, Plasma Dynamics, Vertical Distribution, Wind Effects

Scientific paper

A 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.

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