Other
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2835i&link_type=abstract
Journal of Geophysical Research, vol. 81, June 1, 1976, p. 2835-2843. Research supported by the Lockheed Independent Research P
Other
18
Atmospheric Radiation, Gamma Rays, Radiant Flux Density, Satellite Observation, Atmospheric Attenuation, Cosmic Rays, Data Acquisition, Diffuse Radiation, Energy Spectra, High Resolution, Polar Orbits, Satellite-Borne Instruments
Scientific paper
Data are presented on the gamma ray emitted from the atmosphere to satellite altitudes in the absence of bremsstrahlung X-rays associated with electron precipitation from the radiation belts. The measurements (40 keV to 2.7 MeV) were performed with a high-resolution germanium spectrometer on board the polar-orbiting satellite 1972-076B. The variations of the atmospheric gamma rays with invariant latitude are presented. Over the polar caps, the energy spectra are similar to those observed near the magnetic equator, and the intensities are higher by about a factor of 4. The spectral indices for least-squares power-law fits to the continuum are approximately -1.34 and -1.39 for the polar cap and equatorial regions, respectively. A search was made for gamma-ray lines emitted from the atmosphere in addition to the 511-keV annihilation line. Several peaks were observed in the background spectrum, but no other lines were seen to be emitted from the atmosphere with a significant intensity.
Imhof William L.
Nakano George H.
Reagan J. B.
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