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Interesting that Jasper Kirkby pointed in 2008 to the question answered by Svensmark in 2017.
Cosmic Rays and Climate
https://arxiv.org › physics
by J Kirkby - 2008 - Cited by 200 - Related articles
Apr 11, 2008 - Over the last few years, however, diverse reconstructions of past climate change have revealed clear associations with cosmic ray variations ...
[FONT="]. . . Over the last few years, however, diverse reconstructions of past climate change have revealed clear associations with cosmic ray variations recorded in cosmogenic isotope archives, providing persuasive evidence for solar or cosmic ray forcing of the climate. However, despite the increasing evidence of its importance, solar climate variability is likely to remain controversial until a physical mechanism is established. Although this remains a mystery, observations suggest that cloud cover may be influenced by cosmic rays, which are modulated by the solar wind and, on longer time scales, by the geomagnetic field and by the galactic environment of Earth. Two different classes of microphysical mechanisms have been proposed to connect cosmic rays with clouds: firstly, an influence of cosmic rays on the production of cloud condensation nuclei . . . .[/FONT]
Cosmic Rays and Climate
https://arxiv.org › physics
by J Kirkby - 2008 - Cited by 200 - Related articles
Apr 11, 2008 - Over the last few years, however, diverse reconstructions of past climate change have revealed clear associations with cosmic ray variations ...
[FONT="]. . . Over the last few years, however, diverse reconstructions of past climate change have revealed clear associations with cosmic ray variations recorded in cosmogenic isotope archives, providing persuasive evidence for solar or cosmic ray forcing of the climate. However, despite the increasing evidence of its importance, solar climate variability is likely to remain controversial until a physical mechanism is established. Although this remains a mystery, observations suggest that cloud cover may be influenced by cosmic rays, which are modulated by the solar wind and, on longer time scales, by the geomagnetic field and by the galactic environment of Earth. Two different classes of microphysical mechanisms have been proposed to connect cosmic rays with clouds: firstly, an influence of cosmic rays on the production of cloud condensation nuclei . . . .[/FONT]