Fig 3 from paper, my words. Upper, red is supposed mathematical model where droplet size is unable to grow, blue is actual result. Lower, control without radiation, also a fail.
“Response of Cloud Condensation Nuclei (> 50 nm) to changes in ion-nucleation”
Henrik Svensmark, Martin B. Enghoff, and Jens Olaf Pepke Pedersen
Cite: http://arxiv.org/abs/1202.5156v1 preprint
“In experiments where ultraviolet light produces aerosols from trace amounts of ozone, sulphur dioxide, and water vapour, the number of additional small particles produced by ionization by gamma sources all grow up to diameters larger than 50 nm, appropriate for cloud condensation nuclei. This result contradicts both ion-free control experiments and also theoretical models that predict a decline in the response of larger particles due to an insufficiency of condensable gases (which leads to slower growth) and to larger losses by coagulation between the particles. This unpredicted experimental finding points to a process not included in current theoretical models, possibly an ion-induced formation of sulphuric acid in small clusters.”
This paper reports a very important result which if confirmed is experimental evidence cosmic ray cloud seeding, given suitable atmospheric trace chemicals can produce particles large enough to seed clouds.
Nigel Calder write more about this. (link below).
Nigel Calder has a second blog post up to try and persuade some of the disbelievers. Climate-Physics-101 [/update]
Posted by Tim Channon, co-moderator