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On the Asymmetry of the Distribution of the Anomalous Cosmic-Ray Component in the Heliosphere

Published online by Cambridge University Press:  12 April 2016

Horst Fichtner ,
S. Ranga Sreenivasan ,
Hans-Jörg Fahr ,
Daniel Rucinski  and
Stanislaw Grzedzielski
Horst Fichtner
Affiliation:
Department of Physics and Astronomy, University of Calgary, 2500 , University Drive N.W., Calgary, Alberta, CanadaT2N 1N4 Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn, Auf dem Hügel 71, W-5300 Bonn, Germany
S. Ranga Sreenivasan
Affiliation:
Department of Physics and Astronomy, University of Calgary, 2500 , University Drive N.W., Calgary, Alberta, CanadaT2N 1N4
Hans-Jörg Fahr
Affiliation:
Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn, Auf dem Hügel 71, W-5300 Bonn, Germany
Daniel Rucinski
Affiliation:
Space Research Centre, Bartycka 18a, 00716 Warsaw, Poland
Stanislaw Grzedzielski
Affiliation:
Space Research Centre, Bartycka 18a, 00716 Warsaw, Poland

Abstract

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An analysis based on a fluid type equation for the spatial diffusion of the anomalous component of cosmic rays in the solar wind is presented. The source distributions of the high-energy particles are related to the pick-up ion flux intensities at the position of the heliospheric shock. Due to the strong asymmetric distributions of the different species of pick-up ions in the heliosphere and a possible aspherical termination shock of the solar wind, the source distributions are expected to exhibit element specific upwind-downwind asymmetries. An analytical treatment of the problem, using boundary conditions derived from observations by the Pioneer and Voyager satellites, leads to an estimate of the asymmetries of the anomalous component in the heliosphere. The investigation is performed in two stages: the problem is solved for an axially symmetric heliosphere in the first instance, and a latitudinal variation of the solar wind velocity as well as in the hydrodynamic diffusion coefficient is incorporated to model the effects of a heliospheric magnetic field in the second.

Subject headings: acceleration of particles — cosmic rays — shock waves — solar wind

Type
Interplanetary Medium
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 595 - 597
Copyright
Copyright © The American Astronomical Society 1994

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