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Phase-coherent oscillatory modes in solar and geomagnetic activity and climate variability

Milan Palus
Institute of Computer Science, Academy of Sciences of the Czech Republic
Pod vodárenskou vezí 2, 182 07 Prague 8, Czech Republic

Dagmar Novotna
Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic
Bocni II/1401, 141 31 Prague 4, Czech Republic


Oscillatory modes with the period of approximately 7--8 years were detected in monthly time series of sunspot numbers, geomagnetic activity aa index, NAO index and near-surface air temperature from several mid-latitude European locations. Instantaneous phases of the modes underwent synchronization analysis and their statistically significant phase coherence, beginning from 1950's, has been observed. Thus the statistical evidence for a coupling between solar/geomagnetic activity and climate variability has been obtained from continuous monthly data, independent of theto oscillatory periods about 7--8 years.

J. Atmospheric and Solar-Terrestrial Physics 71 (8-9) (2009) 923 -- 930. -- 10.1016/j.jastp.2009.03.012

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Milan Palus 2009