Evidence of an anisotropy in the arrival direction of cosmic rays with energies above 1019eV

11 December 1974

journal article
Published by IOP Publishing in Journal of Physics A: Mathematical, Nuclear and General

Vol. 7 (18) , L176-L180
https://doi.org/10.1088/0305-4470/7/18/003

Abstract

Evidence is presented that the arrival direction distribution of cosmic rays with energies above 10¹⁹ eV is not isotropic. Harmonic analyses indicate that there is, prima facie, a first harmonic (amplitude=44%, chance probability=2.6%, phase (in right ascension)=13.3+or-1.5 h) at declinations above 0 degrees , and that there is a significant second harmonic (amplitude=101%, chance probability=0.2%, phase 7.8, 19.8+or-1 h) at declinations below -30 degrees . Supporting evidence from low energy data is also discussed.

Keywords

DISTRIBUTION
SECOND HARMONIC
COSMIC RAY

This publication has 1 reference indexed in Scilit:

Isotropy of the arrival directions of ultra high energy cosmic rays
Nature, 1974