Sporadic and recurrent geomagnetic disturbances in 1859-1860 according to the archived data from the Russian network of stationsстатья
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Аннотация:Based on an analysis of the available archived data from the Russian network of geomagnetic stations, it has been indicated that the known event of August-September 1859 was the first and the greatest event in the series of the recurrent geomagnetic storms. Similar series were repeatedly observed in the next years. These series are caused by the processes on the Sun and in the heliosphere related to the superposition of the solar wind flows. The sporadic and regular components in joint activity of the complex, including active regions and coronal holes on the rotating Sun, play the role of the Bartels M regions responsible for initiation and development of geomagnetic storms. Neither coronal holes nor active regions can separately explain observations. During interpretation, active regions and coronal holes should be considered as a unified complex.