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Space climatology was a topic at the 1978 AGU Spring Meeting. Martin A. Pomerantz and Shakti P. Duggal of the Bartol Research Foundation of the Franklin Institute , Swarthmore, Pennsylvania, gave a space weather report based on information from Pioneer observations beyond the orbit of Jupiter. The Bartol physicists found that the rate at which the density of cosmic rays increases with distance from the sun changes during the sunspot cycle. The mechanisms by which the solar influence is exercised over long distances are not well understood, but this interesting clue to the reasons for long-term variations in the cosmic ray population in the inner solar system could be an important link in unraveling the nature of solar-terrestrial couplings.