The Unified Astronomy Thesaurus

Sunspot number

http://astrothesaurus.org/uat/1652

alt label
Relative sunspot number
SSN
Wolf number
dcterms modified equal to or less than 2020-11-19T16:25:42.245Zequal to or more than 2020-11-19T16:25:42.245Z
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http://astrothesaurus.org/uat/1653 original
narrower
1652 original
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.
type
Resource original
Concept original
contributor AAS_Frey.Katie original