A straightforward estimation of the maximum sunspot number for cycle 23

B. Mendoza (1) , J. Ramirez (1)

1 Insituto de Geofisica UNAM

Using the annual number of geomagnetically quiet days (aa < 20 ?) 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.

Domains: Ocean, Atmosphere; Earth Sciences

B. Mendoza, J. Ramirez. A straightforward estimation of the maximum sunspot number for cycle 23. Annales Geophysicae, 1999, 17 (5), pp.639-641. ⟨hal-00316589⟩