A Proposed Form for the Atmospheric Microtemperature Spatial Spectrum in the Input Range
Abstract
Measurements of the atmospheric microtemperature statistics demonstrate poor agreement with the traditional von Karman model for large scale sizes. Data were taken during four missions at two sites which have a minimum of terrain inhomogeneities. At Kirtland AFB the sensors were at 20m and 33m above ground which has sparse low vegetation. At Griffiss AFB the sensors are 2m above grassy terrain and there are clumps of trees far upwind. The conditions were nearly ideal: high turbulence strengths and good mixing at mid-day. A model spatial spectrum is proposed with parameters to set the two power law dependencies and the transition rate between them. Temporal spectral data compare favorably with the proposed model and the residual error is attributed to the inappropriateness of the frozen flow hypothesis. The model is recommended for laser propagation calculations which depend on large scale sizes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1974
- Accession Number
- AD0776294
Entities
People
- Darryl P. Greenwood
- Donald O. Tarazano
Organizations
- Rome Laboratory