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Production of gamma rays with energies greater than 30 MeV in the atmosphereA three-dimensional study of atmospheric gamma rays with energy greater than 30 MeV has been carried out. Experimental results were obtained from four balloon flights from Palestine, Texas, with a 15 cm by 15 cm digitized wire grid spark chamber. The energy spectrum for downward-moving gamma rays steepens with increasing atmospheric depth. Near the top of the atmosphere, the spectrum steepens with increasing zenith angle. Experimental results compare reasonably well with a three-dimensional Monte Carlo calculation of atmospheric gamma ray production. Inclusion of upward-moving gamma rays makes possible the use of atmospheric secondaries for in-flight calibration of satellite gamma ray detectors.
Document ID
19740047471
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Thompson, D.
(Maryland, University, College Park; NASA, Goddard Space Flight Center Greenbelt, Md., United States)
Fichtel, C.
Kniffen, D.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1974
Subject Category
Space Radiation
Meeting Information
Meeting: International Cosmic Ray Conference
Location: Denver, CO
Start Date: August 17, 1973
End Date: August 30, 1973
Accession Number
74A30221
Funding Number(s)
CONTRACT_GRANT: NGL-21-002-033
Distribution Limits
Public
Copyright
Other

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