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By P Gosselin on 18. April 2017
The sun in March 2017 By Frank Bosse and Prof. Fritz Vahrenholt (Translated/edited by P. Gosselin) Our source of energy continued to be especially quiet last month. The mean sunspot number (SSN) was 17.7 and the sun was completely blank for 16 days. It is important to recall once again that the SSN is not […]