Global excitation of wave phenomena in a dissipative multiconstituent medium. III - Response characteristics for different sources in the earth's thermosphere

Details Global excitation of wave phenomena in a dissipative multiconstituent medium. III - Response characteristics for different sources in the earth's thermosphere Global excitation of wave phenomena in a dissipative multiconstituent medium. III - Response characteristics for different sources in the earth's thermosphere

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.7657m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 1, 1987, p. 7657-7672.

Physics

10

Atmospheric Models, Gravity Waves, Thermosphere, Wave Excitation, Atmospheric Heating, Auroras, Electric Fields, Resistance Heating, Transfer Functions

Scientific paper

A linear trasnfer function model of the earth's thermosphere which includes the electric field momentum source is used to study the differences in the response characteristics for Joule heating and momentum coupling in the thermosphere. It is found that, for Joule/particle heating, the temperature and density perturbations contain a relatively large trapped component which has the property of a low-pass filter, with slow decay after the source is turned off. The decay time is sensitive to the altitude of energy deposition and is significantly reduced as the source peak moves from 125 to 150 km. For electric field momentum coupling, the trapped components in the temperature and density perturbations are relatively small. In the curl field of the velocity, however, the trapped component dominates, but compared with the temperature and density its decay time is much shorter. Outside the source region the form of excitation is of secondary importance for the generation of the various propagating gravity wave modes.

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