NorthHemisphere patterns of phase coherence between solar/geomagmetic activity andNCEP/NCARandERA40 near-surface air temperature in period 7-8y oscillatorymodes

Beginning from 1950’s, Paluš and Novotná (J. Atmos. Sol.-Terr. Phys. 71, 923–930, 2009) observed statistically significant phase coherence among oscillatory modes with the period of approximately 7–8 years detected in monthly time series of sunspot numbers, geomagnetic activity aa index, NAO index and near-surface air temperature from several mid-latitude European stations. Using again the oscillatory modes with the period 7-8y, here we study North Hemisphere patterns of phase coherence between solar/geomagnetic activity and NCEP/NCAR and ERA40 near-surface air temperature. Both the reanalysis datasets provide consistent patterns of areas with marked, statistically significant coupling between solar/geomagnetic activity and climate variability observed in continuous monthly data, independent of the season, however, confined to the temporal scale related to oscillatory periods about 7–8 years.