Milan Palus
Institute of Computer Science,
Academy of Sciences of the Czech Republic
Pod vodárenskou vezí 2,
182 07 Prague 8, Czech Republic
E-mail: mp@cs.cas.cz
Dagmar Novotna
Institute of Atmospheric Physics,
Academy of Sciences of the Czech Republic
Bocni II/1401,
141 31 Prague 4, Czech Republic
E-mail: nov@ufa.cas.cz
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.