Cosmic ray gradients in the Galaxy

The analysis of cosmic gamma-ray data from the SAS II experiments by Dodds et al. (1975) strongly suggested that there was a gradient of cosmic ray intensity in the Outer Galaxy, shared by both electrons and protons, and that this indicated that both types of particle were derived largely from Galac...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 1984-11, Vol.140 (2), p.284-287
Main Authors: BHAT, C. L, MAYER, C. J, WOLFENDALE, A. W
Format: Article
Language:English
Subjects:
Astronomy
Cosmic rays
Earth, ocean, space
Exact sciences and technology
Solar system
Online Access:Get full text
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Summary:The analysis of cosmic gamma-ray data from the SAS II experiments by Dodds et al. (1975) strongly suggested that there was a gradient of cosmic ray intensity in the Outer Galaxy, shared by both electrons and protons, and that this indicated that both types of particle were derived largely from Galactic sources at the energies in question of E(e) less than about 0.5 GeV, and E(p) in the 1-10 GeV range. Other workers have concurred, but very recently Bloemen et al. (1984) have come to the opposite conclusion insofar as the protons are concerned, viz, that there is no discernible gradient in the Outer Galaxy. This conclusion is not inescapable however, on the basis of the currently available data. The present work comprises a number of studies, and these all indicate that the original conclusion may indeed be correct, i.e. that there is a gradient of protons.
ISSN:0004-6361
1432-0746