Interrelationship of cosmic-ray anisotropies and the interplanetary magnetic field

McCracken, K. C. ; Rao, U. R. ; Ness , N. F. (1968) Interrelationship of cosmic-ray anisotropies and the interplanetary magnetic field Journal of Geophysical Research, 73 (13). pp. 4159-4166. ISSN 0148-0227

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Official URL: http://www.agu.org/pubs/crossref/1968/JA073i013p04...

Related URL: http://dx.doi.org/10.1029/JA073i013p04159

Abstract

The direction of the cosmic-ray anisotropy during solar proton events and the concurrent direction of the interplanetary magnetic field vector are compared, using data obtained in 1966 by the Pioneer 6 spacecraft. It is shown that the nonequilibrium cosmic-ray anisotropy (normally observed to exhibit an amplitude in the range 20-50%) is field-aligned, while the equilibrium anisotropy (normally observed to exhibit an amplitude in the range 5-15%) is independent of the direction of the magnetic field vector. Two anomalous proton events during which pronounced anisotropies were observed with their maximum cosmic-ray fluxes directed toward the sun are discussed. It is shown that during these proton events there were synchronous reversals of 180° in the direction of the magnetic field vector and the cosmic-ray anisotropy in association with the passage of a magnetic sector boundary past the spacecraft. These observations are interpreted as possible evidence for there being a complex loop in the magnetic field.

Item Type:Article
Source:Copyright of this article belongs to American Geophysical Union.
ID Code:73060
Deposited On:30 Nov 2011 04:03
Last Modified:30 Nov 2011 04:03

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