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A straightforward estimation of the maximum sunspot number for cycle 23

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Annales Geophysicae

Abstract

Using the annual number of geomagnetically quiet days (aa < 20 γ) for the year after the solar minimum, this precursor method predicts that the maximum sunspot number for cycle 23 will be 140 + 32, indicating that cycle 23 will be similar to cycles 21 and 22.

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Authors and Affiliations

  1. Insituto de Geofisica UNAM, Ciudad Universitaria, 04510, México D.F., Mexico

    B. Mendoza & J. Ramírez

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  1. B. Mendoza
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  2. J. Ramírez
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Correspondence to B. Mendoza.

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Mendoza, B., Ramírez, J. A straightforward estimation of the maximum sunspot number for cycle 23. Annales Geophysicae 17, 639–641 (1999). https://doi.org/10.1007/s00585-999-0639-7

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  • DOI: https://doi.org/10.1007/s00585-999-0639-7

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