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  1. No Access

    Article

    A straightforward estimation of the maximum sunspot number for cycle 23

    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 tha...

    B. Mendoza, J. Ramírez in Annales Geophysicae (1999)

  2. No Access

    Article

    Geomagnetic activity and wind velocity during the Maunder minimum

    Following a given classification of geomagnetic activity, we obtained aa index values for the Maunder minimum (1645–1715). It is found that the recurrent and fluctuating activities were not appreciable and that t...

    B. Mendoza in Annales Geophysicae (1997)