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https://www.aanda.org/articles/aa/abs/2017/03/aa29604-16/aa29604-16.html
Hale cycle and long-term trend in variation of galactic cosmic rays related to solar rotation |...
Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics
long term trend
hale cycle
variation
galactic