Abstract
As an index for the solar ‘activity’ the sunspot relative numbers have been generally adopted: they were defined by Wolf, Wolffer and Brunner, at the Zürich Observatory where they are still now regularly determined on the basis of observational work done over the whole world.
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References
Gleissberg, W.: 1952, Die Häufigkeit der Sonnenflecken, Berlin.
Waldmeier, M.: 1955, Ergebnisse und Probleme der Sonnenforschung, Leipzig.
Waldmeier, M.: 1961, The Sunspot Activity in the Years 1610–1960, Zürich, pp. 20, 21.
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© 1987 D. Reidel Publishing Company
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Kleczek, J. (1987). The Solar Cycle (L). In: Kleczek, J. (eds) Exercises in Astronomy. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3769-7_33
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DOI: https://doi.org/10.1007/978-94-009-3769-7_33
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-277-2423-6
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