Sector structure of the interplanetary magnetic field and anisotropy of 50–1000 GV cosmic rays |
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| Authors: | G Erd?s J Kóta |
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| Institution: | (1) Dept of Cosmic Rays, Central Research Institute of Physics, Budapest, Hungary |
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| Abstract: | It is demonstrated that, at high rigidities (50 GV and beyond), all the main features of cosmic-ray anisotropy of solar origin
can be explained in terms of regular particle motion —without diffusion being involved — in the large-scale interplanetary
magnetic field (IMF). A simple model of the IMF is adopted with a corotating warped neutral sheet separating the regions of
alternative polarities; the warped shape is indispensable for obtaining any form of anisotropy. Energy losses occurring along
various computed trajectories are calculated to give the sidereal, solar and antisidereal intensity waves. The reliability
of the variations obtained are checked by changing the parameters of the IMF model. Both the sense and amplitude of the polarity-dependent
sidereal vector are compatible with those established experimentally. Also reproduced are the predictions of corotation in
addition to the 3-hour phase of the semi-diurnal wave. The corotation is found to be near perfect at 50 GV, while it reduces
at 100 GV. The model presented accounts for the change of solar daily vector that was observed in 1969. |
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