Accession Number : AD0635767

Title :   PROFILE TYPES OF SOUND SPEED IN THE LOWER ATMOSPHERE AND THEIR RELATIONSHIPS TO ACOUSTIC FOCUSING.

Corporate Author : ARMY MISSILE COMMAND REDSTONE ARSENAL ALA PHYSICAL SCIENCES LAB

Personal Author(s) : Essenwanger,Oskar M.

Report Date : 15 APR 1966

Pagination or Media Count : 36

Abstract : The derivation of characteristic profiles for the sound speed is discussed and a classification system introduced. The system comprises 32 types of sound profiles with subsequent division into three groups, namely without and with returning rays and with focusing. The idealized 32 prototypes of the classification system are based on the percentage reduction for orthogonal polynomials and the sound speed profiles are classified by utilization of the maximum relationship with the prototypes. The types show significant relationship with acoustic focusing and display practically no seasonal, azimuthal, or climatic variation for focusing. Therefore, seasonal, azimuthal, and climatic changes are caused by the occurrence of types. These seasonal, climatic, and azimuthal fluctuations of the types are presented. (Author)

Descriptors :   (*SOUND, *ATMOSPHERES), PROPAGATION, VELOCITY, NOISE

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE