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Despite over 35 years of constant satellite-based measurements of cloud,reliable evidence of a long-hypothesized link between changes in solar activityand Earth's cloud cover remains elusive. This work examines evidence of acosmic ray cloud link from a range of sources, including satellite-based cloudmeasurements and long-term ground-based climatological measurements. Thesatellite-based studies can be divided into two categories: 1) monthly todecadal timescale correlations, and 2) daily timescale epoch-superpositional(composite) analysis. The latter analyses frequently focus on high-magnitudereductions in the cosmic ray flux known as Forbush Decrease (FD) events. Atpresent, two long-term independent global satellite cloud datasets areavailable (ISCCP and MODIS). Although the differences between them areconsiderable, neither shows evidence of a solar-cloud link at either long orshort timescales. Furthermore, reports of observed correlations between solaractivity and cloud over the 1983 to 1995 period are attributed to the chanceagreement between solar changes and artificially induced cloud trends. It ispossible that the satellite cloud datasets and analysis methods may simply betoo insensitive to detect a small solar signal. Evidence from ground-basedstudies suggests that some weak but statistically significant CR-cloudrelationships may exist at regional scales, involving mechanisms related to theglobal electric circuit. However, a poor understanding of these mechanisms andtheir effects on cloud make the net impacts of such links uncertain. Regardlessof this, it is clear that there is no robust evidence of a widespread linkbetween the cosmic ray flux and clouds.

A cosmic ray-climate link and cloud observations