Concept information
Preferred term
Sunspot number
Definition
- A quantity which gives the number of sunspots at a given time. It is defined by the relationship R = k(10g + f), where R is the sunspot number, k is a constant depending on the observation conditions and the instrument used, g is the number of the groups and f is the number of individual spots that can be counted. (en)
Broader concept
- Sunspots (en)
Entry terms
- Relative sunspot number (en)
- SSN (en)
- Wolf number (en)
URI
http://astrothesaurus.org/uat/1652
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