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Durham University

Department of Physics

Staff profile

Publication details for Prof Sir Arnold Wolfendale

Erlykin, AD & Wolfendale, AW (2001). Supernova remnants and the origin of the cosmic radiation: II. Spectralvariations in space and time. Journal Of Physics G-nuclear And Particle Physics 27(5): 959-976.
  • Publication type: Journal Article
  • ISSN/ISBN: 0954-3899
  • Keywords: RAY SPECTROSCOPY

Author(s) from Durham

Abstract

The model described by us earlier (Erlykin and Wolfendale 2001aJ. Phys.
CI Nucl. Part. Phys, 27 941), which involves Monte Carlo calculations
for cosmic rays accelerated by supernova remnants in the interstellar
medium, has been used to predict Galactic cosmic ray energy spectra as
a function of space and time. Moderate variations of cosmic ray
characteristics connected with the random spacetime distribution of
supernovae are found to be accompanied by much stronger changes caused
by explosions of nearby and recent supernovae.
The spatial variations have been compared with results from gamma ray
astronomy which relate to possible small variations in spectral shape
for the average cosmic ray proton intensity in the energy range 3-100
GeV out to distances of some 100s of pc from the Earth (Fatoohi ct nl
1995 J. Phys. GI Nucl. Part. Phys. 21 679). Similarly, comparison has
been made with results from radio-astronomy, which relate to the
electron component. There is found to be no inconsistency with the
model predictions in either case.
The predicted temporal changes in the cosmic ray intensity at Earth in
the range 10-50 GeV, appropriate to cosmogenic nucleus measurements,
are, again, not inconsistent with those observed tan upper limit of a
few 10s of per cent, with the value depending on the cosmogenic nucleus
under study).
The amplitude of the anisotropy in arrival directions of cosmic rays
predicted by the model is of the order of that observed (typically 1%
at 1 PeV) for the situation where there has been a local, recent
supernova.