Galactic modulation of extragalactic cosmic rays -Alternative scenario of the origin of the knee-

Abstract

Recently we have shown that the observed knee structure is reproduced well by a superposition of the hypothetical extragalactic cosmic rays modulated by the galactic wind and the galactic cosmic rays originating in supernova remnants. We reexamine this model assuming the chemical composition of the hypothetical extragalactic cosmic rays is the same as that of the galactic cosmic rays of supernova origin. The knee structure is reproduced well again. The energy dependence of mean mass of cosmic rays above the knee energy is presented to be compared with observations. .