Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh23b0341k&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH23B-0341
Physics
2104 Cosmic Rays, 2126 Heliosphere/Interstellar Medium Interactions, 2134 Interplanetary Magnetic Fields
Scientific paper
The occurrence of 26-day recurrent cosmic-ray intensity variations follows naturally from Fisk-type heliospheric magnetic fields. This was demonstrated by Burger and Hitge (2004, ApJL, 617) who used a divergence-free Fisk-Parker hybrid field. This approach has been refined (Kruger, 2005, M.Sc. thesis, North-West University, in preparation) and we present the latest results. The steady-state three-dimensional version of Parker's transport equation for cosmic rays is solved numerically for both protons and for electrons. Following Burger and Hitge (2004), we model the amplitude of 26-day recurrent variations of both protons and electrons as function of the latitudinal gradient, but now also as function of heliolatitude. We will also use the phase difference between the variations of the two species, and study the role of the wavy current sheet, to determine whether a Fisk-type field can account for the observed properties of 26-day cosmic-ray variations at all latitudes covered by the Ulysses mission.
Burger R. A.
Hitge M.
Kruger T. P.
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