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Ann. Geophys., 17, 639-641, 1999
www.ann-geophys.net/17/639/1999/
© European Geosciences Union 1999
A straightforward estimation of the maximum sunspot number for cycle 23
B. Mendoza and J. Ramírez
Insituto de Geofisica UNAM, Ciudad Universitaria, 04510 México D.F., MEXICO
E-mail: blanca@tonatiuh.igeofcu.unam.mx
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.
Key words. Solar physics · astrophysics and astronomy
(magnetic fields; general)
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