An Upper Limit on Sunspot Activity During the Maunder Minimum

Details An Upper Limit on Sunspot Activity During the Maunder Minimum An Upper Limit on Sunspot Activity During the Maunder Minimum

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..224...95k&link_type=abstract

Solar Physics, Volume 224, Issue 1-2, pp. 95-101

Physics

5

Scientific paper

We have estimated the upper and lower limits of sunspot activity, in terms of active day fraction during the Maunder minimum (1645 1710), using raw information on individual daily observations (Hoyt and Schatten, 1998). Establishing the relation between the sunspot activity and active day fraction after 1850, we evaluate the upper limit of annual group sunspot number during the deep Maunder minimum (1645 1700) which does not exceed 4. The earlier finding of a dominant 22-year periodicity during the Maunder minimum is verified and shown to be robust. Also we confirm that the start of the Maunder minimum was very abrupt.

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