Accession Number : AD0718961

Title :   Influence of Gravity Waves on Transient Heating Response of the Upper Atmosphere.

Descriptive Note : Rept. for Aug 69-Feb 70,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Chiu,Yam T. ; Ching,Barbara K.

Report Date : 15 DEC 1970

Pagination or Media Count : 51

Abstract : It is shown that the presence of gravity wave interaction with a transiently heated atmosphere changes the atmospheric response to heating significantly. The energy exchange between wave and ambient atmosphere manifests itself as an apparent increase in effective thermal diffusivity. The present model predicts altitude independent (<200 km) temperature and density time lags which are in phase and are (6 plus or minus 2) hours for a mean heating duration of (2-6) hours. It is shown that the above response characteristics are essentially independent of the spatial distribution and location of the primary heat source. This tendency is a consequence of the increased heat diffusion due to energy exchange between wave and ambient atmosphere. The energy loss to gravity waves during the falling phase of the response leads to the prediction of a relaxation time of (15 plus or minus 3) hours measured from the beginning of density decrease. The mean relaxation time for discernible major events in the Explorer 9 data is approximately 13 hours. (Author)

Descriptors :   (*UPPER ATMOSPHERE, HEATING), IONS, INTERACTIONS, ELECTRONS, THERMAL PROPERTIES, DIFFUSION, ATMOSPHERE MODELS, DENSITY

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE