Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615863d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,863-15,870.
Physics
1
Galactic Cosmic Rays, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Solar Cycles, Magnetic Field Configurations, Magnetohydrodynamic Stability, Radiation Transport, Solar Wind Velocity
Scientific paper
The present paper demonstrates that solar cycle variations of the cross helicity of the Alfvenic turbulence can be the cause of the solar modulation of the galactic cosmic rays and its charge dependence if combined with nonvanishing magnetic helicity values of the turbulence. It is argued that the ratio of forward propagating Alfven waves originating on the sun to the total intensity is high at solar maxima and low at solar minima, whereas the intensity of backward moving waves probably originating by the pickup ion instability stays constant on time scales long compared to the 11-year periodicity. The present explanation fulfills the observational constraints that the average solar wind speed stays constant and that the total level of magnetic fluctuation power remains constant within 25 percent during the solar cycle.
Dung Rudiger
Schlickeiser Reinhard
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