(Solar Phys.). The observed enrichment of heavy nuclei in the composition of relativistic cosmic rays including solar, may be explained on the basis of a coherent accelerating mechanism. This mechanism requires the existence of high intensity relativistic electron beams or preferably blobs (with number density ≥1011 electrons cm−3) in the accelerating solar regions. The radius of each blob should be less than its plasma wavelength, i.e. of the order of cm.