Relative Sunspot Number

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Relative Sunspot Number

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A measure of sunspot activity, computed from the formula R = k (10 g + f) where R is the relative sunspot number; f is the number of individual spots; g is the number of groups of spots; and k a factor that varies with the observer (his personal equation), the seeing, and the observatory (location and instrumentation). Also called sunspot number, sunspot relative number, Wolf number, Wolf-Wolfer number, Zurich number. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use