Abstract
Observations of cosmogenic nuclei (10Be and 14C) by a number of authors, and summarized by Kocharov et al. (1990), have drawn attention to the possibility of an increase in cosmic ray proton intensity over a period lasting several 103 y some 30*103 y ago. The authors examine the possibility that it represents the passage of a supernova remnant shock wave. They have shown previously, from studies in gamma ray astronomy, that SNR acceleration is a likely mechanism for the acceleration of cosmic ray protons in the GeV region. They conclude that the 'pulse' of protons responsible for the cosmogenic nuclei can, indeed, be explained in this way, although it is premature to make a definitive statement.
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