Atmospheric Propagation Studies up to 30 September 1969
Abstract
A summary is given of significant results obtained during the research effort corresponding to the period 1 September 1968 - 30 September 1969. Particular emphasis was given to the construction of a phase-path doppler sounder array. Signals detected by the microbarograph array on the occasion of the Chinese nuclear test of 29 September 1969 are compared with signals from previous tests. There appears to be a seasonal effect on the propagation and/or bandwidth of these signals. Preliminary work on ionospheric motion background using phase-path sounder data indicates that the background activity can be broadly separated into two period ranges: periods longer and shorter than 5 minutes. The shorter periods appear to have a hydromagnetic origin while the longer periods are probably due to internal gravity wave activity. A theoretical investigation of the interaction between instability waves and internal gravity waves in the atmosphere showed that internal gravity waves are trapped within a layer where the shear flow velocity is greater than the speed of sound and that the phase velocity of the internal gravity waves is approximately equal to the maximum velocity of the shear flow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1970
- Accession Number
- AD0716541
Entities
People
- Chester E. Grosch
- Eric S. Posmentier
- Hernan A. Montes
- Melvin J. Hinich