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Dalton Minimum

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November 06, 2010


Børge Svanstrøm Amundsen

"While analysing seismic activity of the Earth it is not difficult to notice the connection with solar activity. The considered line has essential negative correlation with the line of solar activity. The maximal earthquakes are observed during the minimum of solar activity or during the periods close to a minimum, and, on the contrary, in maxima of solar activity seismicity of the Earth accepts the least values."

"Volcanic activity on the Earth is described by special annual indices available since 1500. These indices have been compared with annual sunspot numbers. Volcanic activity displays no 11-yr periodicity. Using 21-yr running averages a striking similarity between these two time series is clearly seen. Volcanic activity is generally lower in periods of prolonged maxima of solar activity and higher in periods of prolonged solar minima. There is also a similarity between the spectra of these two series in the long-period range. Main peaks are located in the same periods in both series (200-215 yr, 100-105 yr, 80-90 yr). The influence of volcanic activity on the climte is indubitable. Annual means of surface air temperature display similar long-term periodicity as the volcanic activity."

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