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SAS-2 observations of the diffuse gamma radiation in the galactic latitude interval 10 deg absolute b or equal to 90 degAn analysis of all of the second small astronomy satellite gamma-ray data for galactic latitudes with the absolute value of b 10 deg has shown that the intensity varies with galactic latitude, being larger near 10 deg than 90 deg. For energies above 100 MeV the gamma-ray data are consistent with a latitude distribution of the form I(b) = C sub 1 + C sub 2/sin b, with the second term being dominant. This result suggests that the radiation above 100 MeV is coming largely from local regions of the galactic disk. Between 35 and 100 MeV, a similar equation is also a good representation of the data, but here the two terms are comparable. These results indicate that the diffuse radiation above 35 MeV consists of two parts, one with a relatively hard galactic component and the other an isotropic, steep spectral component which extrapolates back well to the low energy diffuse radiation. The steepness of the diffuse isotropic component places significant constraints on possible theoretical models of this radiation.
Document ID
19770021114
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Fichtel, C. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hartman, R. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kniffen, D. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thompson, D. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Oegelman, H. B. (Middle East Tech. Univ. Ankara, United States)
Oezel, M. E. (Middle East Tech. Univ. Ankara)07(Middle East Tech. Univ., Ankara, United States)
Tuemer, T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
June 1, 1977
Subject Category
Space Radiation
Report/Patent Number
NASA-TM-X-71359
X-662-77-141
Accession Number
77N28058
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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