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Galactic Structure and the Cosmic Ray Anisotropy at 1018eV

Galactic Structure and the Cosmic Ray Anisotropy at 1018eV

R.W. Clay, PASA, 18 (2), in press.
Next Section: Introduction
Contents Page: Volume 18, Number 2

Galactic Structure and the Cosmic Ray Anisotropy at 1018eV

R.W. Clay1

1 Department of Physics and Mathematical Physics, University of Adelaide, Adelaide, South Australia, 5005
rclay@physics.adelaide.edu.au

Abstract:

Cosmic ray arrival directions at energies a little over 1018eV 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 rays - ISM: magnetic fields



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