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Global excitation of wave phenomena in a dissipative multiconstituent medium. III - Response characteristics for different sources in the earth's thermosphereA 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.
Document ID
19870060964
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mayr, H. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Harris, I.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Varosi, F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Herrero, F. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
87A48238
Distribution Limits
Public
Copyright
Other

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