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Static versus Dynamical Cosmic-ray Halos

Published online by Cambridge University Press:  03 August 2017

Frank C. Jones
Frank C. Jones*
Affiliation:
Laboratory for High Energy Astrophysics, Code 665 NASA/Goddard Space Flight Center Greenbelt, MD 20771, USA

Abstract

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The dynamical halo of the Galaxy offers a natural explanation for the form of the variation of cosmic-ray path length with energy. The variation above 1 GeV per nucleon can be understood as due to the variation of the diffusion coefficient, and hence the resident time in the galaxy, with energy. The flattening of the curve below 1 GeV per nucleon is seen to mark a transition to a convection dominated regime where the variation of the diffusion coefficient is no longer a determining factor. It is possible that the random motion of the cosmic rays about the galaxy that prevents us from seeing their sources in a clear manner may enable us to extract information about the galaxy at large and learn something about its large scale motions.

Type
III. Theory and Modelling
Information
Symposium - International Astronomical Union , Volume 144: The Interstellar Disk-Halo Connection in Galaxies , 1991 , pp. 359 - 368
Copyright
Copyright © Kluwer 1991 

References

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