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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. A3, 1107, doi:10.1029/2001JA000058, 2003

Role of low-frequency modes in organizing the inner heliosphere

Oliver Heinen

Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey, USA


Louis J. Lanzerotti

Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey, USA


B. Heber

Department of Physics, University of Osnabrueck, Osnabrueck, Germany


H. Kunow

Instituet fuer Experimentelle und Angewandte Physik, Christian-Albrechts Universitaet, Kiel, Germany


David J. Thomson

Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey, USA


Abstract

Cosmic ray proton data (125 to >2000 MeV) measured in the inner three-dimensional (3-D) heliosphere over the years from 1993 into 2000 by the KET instrument on the Ulysses spacecraft are examined. The data are parameterized and characterized by fitting products of spherical harmonic and sinusoidal frequency functions to three individual proton energy data sets. It is found that the time dependence of the cosmic ray data sets can be rather well characterized by relatively few variables consisting of low-order spherical harmonic modes and a few frequencies of the order of a solar cycle. The results can be useful for analytical and computational studies of cosmic rays in the inner 3-D heliosphere.

Published 11 March 2003.

Index Terms: 2104 Interplanetary Physics: Cosmic rays; 2159 Interplanetary Physics: Plasma waves and turbulence; 7514 Solar Physics, Astrophysics, and Astronomy: Energetic particles (2114).

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Citation: Heinen, O., L. J. Lanzerotti, B. Heber, H. Kunow, and D. J. Thomson (2003), Role of low-frequency modes in organizing the inner heliosphere, J. Geophys. Res., 108(A3), 1107, doi:10.1029/2001JA000058.