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Galactic Structure and the Cosmic Ray Anisotropy at 1018eV

Published online by Cambridge University Press:  05 March 2013

R. W. Clay
R. W. Clay*
Affiliation:
Department of Physics and Mathematical Physics, University of Adelaide, Adelaide, SA 5005, Australia; rclay@physics.adelaide.edu.au
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Abstract

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Cosmic ray arrival directions at energies a little over 1018 eV have been reported to show an excess from directions close to that of the Galactic centre. That result was originally presented by the AGASA group and was later strengthened by an analysis of SUGAR cosmic ray data. We discuss here a second feature of the AGASA data, a deficit in roughly the Galactic anticentre direction.We interpret this as a result of cosmic ray diffusion past us. We find that the most straightforward interpretation of the data then requires that a strong magnetic field exists out of the plane of our Galaxy to distances of at least several kiloparsecs.

Keywords

cosmic raysISM: magnetic fields
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 18 , Issue 2 , 2001 , pp. 148 - 150
Copyright
Copyright © Astronomical Society of Australia 2001

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