Large-scale TIDs and upper atmospheric gravity waves

Details Large-scale TIDs and upper atmospheric gravity waves Large-scale TIDs and upper atmospheric gravity waves

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..245m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, Mar. 1982, p. 245-255.

Physics

Auroral Electrojets, Gravity Waves, Propagation Modes, Traveling Ionospheric Disturbances, Upper Atmosphere, Energy Distribution, F 2 Region, Lorentz Force, Ohmic Dissipation, Resistance Heating, Thermosphere, Vertical Distribution, Wave Propagation

Scientific paper

Excitation of the guided acoustic-gravity waves in the upper thermosphere in response to increased auroral electrojets is calculated in the absence of dissipation under a fully ducted condition. It is shown that a model atmosphere terminated with an isothermal half-space supports a long-period, high-speed mode and that this is the interface mode guided along the half-space termination of the atmosphere. The dispersion properties and the vertical distributions of the kinetic energy density of this mode are found to be similar to those of the so-called 'gravity pseudomode'. The excitation of this mode is computed in order to show how the wave generation depends on the source mechanism (the Lorentz force and Joule heating) and on the source altitude. It is noted that Joule heating can generate the waves with appreciable amplitudes.

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