SIMPLIFIED NORMAL MODE TREATMENT OF LONG-PERIOD ACOUSTIC-GRAVITY WAVES IN THE ATMOSPHERE
Abstract
A discussion of the effects of geometric dispersion due to stratification of the atmosphere on low-frequency mechanical waves generated by nuclear explosions. It is found that the pressure signal can be divided naturally into an early-arriving acoustic-gravity portion and a later acoustic portion, both portions being inversely proportional to the range (geometric spreading included). At very great ranges, however, portions of the gravity wave fall off faster by r(1/6); the effect of dispersion is to reduce the signal by r(-1/2). Most of the signal is composed of many propagating modes which, at a given range and time, will each demonstrate a characteristic frequency. A simplified treatment of the model picture is presented, along with the argument that a ray treatment for the high-frequency portion is appropriate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1965
- Accession Number
- AD0625232
Entities
People
- W. C. Meecham
Organizations
- RAND Corporation