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The distribution of cosmic rays in the galaxy and their dynamics as deduced from recent gamma-ray observationsRecent data from SAS-2 on the galactic gamma ray line flux as a function of longitude reveal a broad maximum in the gamma ray intensity in the region absolute value of l approximately smaller than 30 deg. These data imply that the low energy galactic cosmic ray flux varies with galactocentric distance and is about an order of magnitude higher than the local value in a toroidal region between 4 and 5 kpc from the galactic center. This enhancement can be plausibly accounted for by first order Fermi acceleration, compression and trapping of cosmic rays consistent with present ideas of galactic dynamics and galactic structure theory. Calculations indicate that cosmic rays in the 4 to 5 kpc region are trapped and accelerated over a mean time of the order of a few million years or about 2 to 4 times the assumed trapping time in the solar region of the galaxy.
Document ID
19740010308
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Puget, J. L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Stecker, F. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1974
Subject Category
Space Radiation
Report/Patent Number
NASA-TM-X-70597
X-640-74-17
Accession Number
74N18421
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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