Galactic cosmic ray distribution in the simplest model of termination shock near the heliospheric boundaries |
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| Authors: | Yu L Kolesnyk B A Shakhov |
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| Institution: | 1.Main Astronomical Observatory,National Academy of Sciences of Ukraine,Kiev,Ukraine |
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| Abstract: | The termination shock at the heliospheric boundary is simulated in terms of a two-layer turbulent medium for which the average
radial component of solar wind velocity is nonzero inside the heliosphere and zero for external magnetic inhomogeneities.
Galactic cosmic rays (GCRs) are scattered more strongly in the solar wind than in the interstellar medium. A boundary value
problem for density is defined to describe GCR propagation in the given two-layer medium. The exact analytical solution of
it is derived. The phase density and GCR fluxes in the whole range of the particle energies, as well as the degree of anisotropy
of high-energy GCRs, are determined. The qualitative agreement of theoretical calculations and observed GCR distributions
is obtained. In particular, in the region near the termination shock, an increase in the high-energy particle density and
a decrease in the low-energy particle density are observed. |
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