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The origin of the grains with diameters less than 4 micron from theinclusions in Antarctic ice cores is discussed. It is proposed that thesegrains were initiated by ions stopped in the upper atmosphere. The ions formmolecules, which coagulate and diffuse downwards. These processes give rise toa characteristic mass spectrum of the small grains. Inclusions in ice wereabundant during cold periods of the Pleistocene. This supports a model in whichthe influx of particles is large when Earth's orbit stays within a disk shapedcloud around the Sun. The production of such a cloud may favor light atoms.This should e.g. be apparent in the isotope distribution of Magnesium from thesmall grains. The large grains, which have a variable mass distribution, areterrestrial.

Interpretation of the small grains in the inclusions of ice cores