文档介绍：Solar aspects of papers
Solar modulation models: a diffusion tensor study
, K. Kudelaa, M. Boschinib, D. Grandib, M. Gervasib,
aInstitute of Experimental Physics SAS, Slovak Republic, Watsonova 47, 040 01 Košice, Slovak Republic
bIstituto Nazionale di Fisica Nucleare, Piazza della Scienza 3, 20 126 Milano, Italy
Abstract
We developed a one dimensional model of particle transport in the heliosphere. In contrary to usually used models it is a back-tracing model where a quasi-particle is traced back in time. The model gives us the possibility to work on the problem of reentrant particles in the heliosphere which can be hardly solved by traditional forward tracing method. We estimate the effect of particles that escape from the heliosphere and reenter back, to the process of modulation particles in the heliosphere. Presented here are the results for different values of mean free path of particles in the interstellar space and for different interstellar ic field values.
1. Introduction
The problem of transport and distribution of Galactic Cosmic Rays in the heliosphere and interstellar space is described by Fokker-Planck equation (FPE hereafter) (Parker 1965, Chandrasekhar, S. 1943).
(1)
Where f is the distribution function, r is the distance from the Sun, V is the velocity of radially directed solar wind, K is diffusion coefficient and p is the pa