In Eq. 3.7.10 Qex is the cross-section for re-exchange processes of interstellar neutral hydrogen atoms and protons of the solar wind, Nh (r) is the density distribution of neutral hydrogen in the interplanetary space which is proportional to the neutral hydrogen density Nho in the vicinity of the solar system, N(Ek, r) is the CR density distribution inside the Heliosphere as a function of the particle kinetic energy Ek and distance to the Sun r. The modulation of galactic CR in interplanetary space in the convection-diffusion approximation can be described by equation:

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