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SUNSHINE, CLOUDS AND COSMIC RAYS. E. Palle Bago and C.J. Butler
 

Summary: 1
SUNSHINE, CLOUDS AND COSMIC RAYS.
E. Pall´e Bag´o and C.J. Butler
Armagh Observatory, College Hill, BT61 9DG. Armagh, N. Ireland
ABSTRACT
Our analysis of the new ISCCP (International Satellite
Cloud Climatology Project) D2 cloud data reveals that
there is a correspondence between the low cloud cover
and the galactic cosmic ray flux. Using several proxies
for solar activity and the radiative forcing for the ISCCP
cloud types, we estimate the possible impact that such
a solar-terrestrial connection may have on climate and
find that much of the warming of the past century could
be quantitatively accounted for by the direct and indirect
effects of solar activity. We have also analysed the be-
haviour of the available proxies for cloud cover existing
for the last century, searching for the cloud cover decrease
predicted by the low cloud- cosmic ray flux correlation.
The sunshine records and the synoptic cloud records both
indicate that the total cloud cover over the oceans has in-

  

Source: Armagh Observatory

 

Collections: Physics