Whether cosmic rays are correlated with climate or not, they have been regularly measured by the neutron monitor at Climax Station (Colorado) since 1953 and show no long term trend. No trend = no explanation for current changes.
E1 = A + B*.01
E2 = B
...the cloud cover is delayed by more than half a year relative to the cosmic rays. According to current theory (e.g. Yu and Turco, 2000) the build-up of cloud condensation nuclei is completed within less than a day after an increase of GCRI. Since the lifetime of these cloud condensation nuclei only amounts to a few days a possible formation of clouds must take place within this span of time and not several months later. Therefore, the cloud response to a change in GCRI should be practically instantaneous when viewed on the time scale of Fig. 2.
Another difficulty is the physical interpretation of low cloud cover data based exclusively on infrared measurements from satellites: most low clouds which are positioned below higher clouds cannot be detected from satellites, and since the range of variation of the different cloud types only amounts to a few percent of the respective cloud cover, an inaccuracy of a few percent could entirely spoil the apparent agreement shown in Fig. 2a.
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