Accession Number:

AD0607242

Title:

PROPAGATION OF ACOUSTIC-GRAVITY WAVES IN A TEMPERATURE-AND WIND-STRATIFIED ATMOSPHERE

Descriptive Note:

Scientific rept. no. 2

Corporate Author:

AVCO CORP WILMINGTON MA RESEARCH AND ADVANCED DEVELOPMENT DIV

Personal Author(s):

• Pierce, Allan D.

Report Date:

1964-08-28

Pagination or Media Count:

46.0

Abstract:

A theory is presented which permits the study of the effects of horizontal winds on the dispersion and amplitudes of acoustic-gravity waves in the atmosphere. It is shown that the effective horizontal group velocity for a given frequency in a given normal mode depends on direction of propagation as well as on frequency and that it is not necessarily in the same direction as the horizontal wave number vector. A number of useful integral theorems are derived from a variational principle and one is subsequently applied to the development of a perturbation method for the computation of wind effects on dispersion. Application of the method to a realistic example indicates that winds can appreciably alter the dispersion of the normal modes and that they should be considered in any quantitative interpretation of experimental microbarograms.

Descriptors:

• *ACOUSTICS
• *ATMOSPHERES
• *GRAVITY WAVES
• PROPAGATION
• TEMPERATURE
• INTEGRALS
• WIND
• MECHANICAL WAVES
• THEOREMS
• VARIATIONAL PRINCIPLES
• GEOPHYSICS
• ATMOSPHERIC MOTION
• SOUND TRANSMISSION
• PERTURBATION THEORY

Subject Categories:

• Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE