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Geomagnetic activity and wind velocity during the Maunder minimum

By B. Mendoza


Abstract. Following a given classi®cation of geomagnetic activity, we obtained aa index values for the Maunder minimum (1645±1715). It is found that the recurrent and ¯uctuating activities were not appreciable and that the shock activity levels were very low. The aa index level was due almost entirely to the quiet days. Calculated average solar-wind velocities were 194.

Year: 1997
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