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
Astronomische Mitteilungen, Zürich.
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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© 1969 D. Reidel Publishing Company, Dordrecht, Holland
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Minnaert, M.G.J. (1969). The Solar Cycle (L). In: Practical Work in Elementary Astronomy. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3414-2_45
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DOI: https://doi.org/10.1007/978-94-010-3414-2_45
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