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By P Gosselin on 18. June 2017
Share this…FacebookTwitterFrank Bosse and Prof. Fritz Vahrenholt present their monthly solar activity report at their Die kalte Sonne site. In May the sun was very quiet as sunspot number was a mere 18.8, which is only 36% of what is typical for the month this far into the cycle. Seven days saw no sunspot activity at all. […]