Jordbävningar och norrsken

*Of the historical 31 large volcanic eruptions with index VEI5+, recorded between 1610 and 1955, 29 of these
were recorded when the SSN<46. The remaining 2 eruptions were not recorded when the SSN<46, but rather
during solar maxima of the solar cycle of the year 1739 and in the solar cycle No. 14 (Shikotsu eruption of
1739 and Ksudach 1907) (chart 1).

*Of the historical 8 large volcanic eruptions with index VEI6+, recorded from 1610 to the present, 7 of these
were recorded with SSN<46 and more specifically, within the three large solar minima known : Maunder
(1645-1710), Dalton (1790-1830) and during the solar minimums occurred between 1880 and 1920. As the
only exception, we note the eruption of Pinatubo of June 1991, recorded in the solar maximum of cycle 22
(chart 2).

*Of the historical 6 major volcanic eruptions with index VEI5+, recorded after 1955, 5 of these were not
recorded during periods of low solar activity, but rather during solar maxima, of the cycles 19,21 and 22.
Significant statistically relationship between the great volcanic eruptions and the count of sunspots from 1610 to the present

Mechanisms to explain the Sun‐volcano link probably involve induced changes in the basic state of the atmosphere. Solar flares are believed to cause changes in atmospheric circulation patterns that abruptly alter the Earth's spin. The resulting jolt probably triggers small earthquakes which may temporarily relieve some of the stress in volcanic magma chambers, thereby weakening, postponing, or even aborting imminent large eruptions. In addition, decreased atmospheric precipitation around the years of solar maximum may cause a relative deficit of phreatomagmatic eruptions at those times