Short-term changes in global cloud cover and in cosmic radiation

Details Short-term changes in global cloud cover and in cosmic radiation Short-term changes in global cloud cover and in cosmic radiation

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jastp..70.1122b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, vol. 70, issue 7, pp. 1122-1131

Physics

4

Cloud, Cosmic, Global, Correlation

Scientific paper

Galactic cosmic rays (GCR) have been suggested as a possible contributory mechanism to cloud formation. If these are significant then, in addition to the similarity between long-term (years) changes in GCR and cloud cover, there should also be a similarity over shorter (days) time scales. This paper reports an analysis of changes in global cloud cover and GCR recorded at 3 hourly intervals over 22 years. There is a significant correlation between short-term changes in low cloud cover over northern and southern hemispheres, consistent with about 3% of the variation arising from common factors. However, GCR is not a major factor responsible for cloud cover changes. There is an association between short-term changes in low cloud cover and galactic cosmic radiation over a period of several days. This could arise if approximately 3% of the variations in cloud cover resulted from GCR.

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