VOLUME 85, NUMBER 23
PHYSICAL REVIEW LETTERS
4 DECEMBER 2000
Low Cloud Properties Influenced by Cosmic Rays
Nigel D. Marsh and Henrik Svensmark
Danish Space Research Institute, Copenhagen, Denmark (Received 18 May 2000; revised manuscript received 15 August 2000) The influence of solar variability on climate is currently uncertain. Recent observations have indicated a possible mechanism via the influence of solar modulated cosmic rays on global cloud cover. Surprisingly the influence of solar variability is strongest in low clouds #3 km , which points to a microphysical mechanism involving aero
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