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Summary: Gravity wave influence on the global structure of the diurnal tide in the
mesosphere and lower thermosphere
DAVID A ORTLAND
Northwest Research Associates
14508 NE 20th
St
Bellevue, Washington 98006
ortland@nwra.com
and
M. JOAN ALEXANDER
Colorado Research Associates
3380 Mitchell Lane
Boulder, Colorado 80301
alexand@cora.nwra.com
Abstract
Observations of the diurnal tide from instruments aboard the Thermosphere, Ionosphere,
Mesosphere, Energetics and Dynamics (TIMED) explorer and from the Upper
Atmosphere Research Satellite (UARS) show that the vertical wavelength of the tide is
significantly shorter than what is predicted by tidal theory. The observed vertical
structure of the tide can be reproduced in a mechanistic model by including gravity wave
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