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# Accession Number:

## AD0275125

# Title:

## ATMOSPHERIC DEPTH AND EFFECTIVE SOLID ANGLE FOR RADIATION PENETRATING THE ATMOSPHERE

# Descriptive Note:

# Corporate Author:

## AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

# Report Date:

## 1962-02-01

# Pagination or Media Count:

##
81.0

# Abstract:

## Derivations and numerical evaluation of theoretical expressions for two parameters of interest in problems involving attenuation of extraterrestrial radiation by the atmosphere are presented. These quantities are called atmospheric depth, or air mass, and effective solid angle. The calculations were performed on an IBM 709 computer. Atmospheric depth, expressed as maserties, Geophysics, Ionization, Particles, Energy. Numerical analysis, Digital computers. Derivations and numerical evaluation of theoretical expressions for two parameters of interest in problems involving attenuation of extraterrestrial radiation by the atmosphere are presented. These quantities are called atmospheric depth, or air mass, and effective solid angle. The calculations were performed on an IBM 709 computer. Atmospheric depth, expressed as mass per unit area traversed along straight paths from outside the atmosphere to the location of a detector within the atmosphere, is of importance in the study of cosmic rays, scattering of lights, etc. Atmospheric depth is the line integral of density along the ray path. The effective solid angle at a given altitude for a given type of flux is defined as that number which, multiplied by the initial value of the isotropic flux outside of the atmosphere, gives the observed omnidirectional flux flux integrated over solid angle at the given altitude. Conversely, the effective solid angle permits determination of the desired quantity, initial isotropic flux, from the measured quantity, integrated attenuated flux. The effective solid angles calculated apply to those cases in which the rigidity of the particles and the geomagnetic latitude of the detector are such that the Stormer cone fills the whole sky. Author

# Distribution Statement:

## APPROVED FOR PUBLIC RELEASE

#