Аннотация:The influence of cosmic rays modulated by solar variability and volcanic activity on the aerosol layer is considered. For analysis the Crete (Greenland) acidity ice core record (Crowley et al., 1993) have been used. It was obtained a high correlation between sunspot numbers and acidity background variations that seem to support the mechanism suggested by authors earlier about the cosmic ray influence on climate and global temperatures through aerosol concentration changes. Results of analysis have shown that the acidity ice core index (with exception of volcanic activity) is suitable for demonstration of cosmic ray influence on climate in the Past.