On the Relationship Between Spotless Days and the Sunspot Cycle: A Supplement

Details On the Relationship Between Spotless Days and the Sunspot Cycle: A Supplement On the Relationship Between Spotless Days and the Sunspot Cycle: A Supplement

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006stin...0718264w&link_type=abstract

Technical Report, NASA/TP-2006-214601; M-1170

Computer Science

Sunspot Cycle, Sunspots, Sun, Predictions, Research

Scientific paper

This study provides supplemental material to an earlier study concerning the relationship between spotless days and the sunspot cycle. Our previous study, Technical Publication (TP)-2005-213608 determined the timing and size of sunspot minimum and maximum for the new sunspot cycle, relative to the occurrence of the first spotless day during the declining phase of the old sunspot cycle and the last spotless day during the rising portion of the new cycle. Because the number of spotless days (NSD) rapidly increases as the cycle nears sunspot minimum and rapidly decreases thereafter, the size and timing of sunspot minimum and maximum might be more accurately determined using a higher threshold for comparison, rather than using the first and last spotless day occurrences. It is this aspect that is investigated more thoroughly in this TP.

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