Long-Term Correlation Between the Nao and Solar Activity

Abstract

We extend the correlation analysis of solar signals and the North Atlantic Oscillation (NAO) back in time by using the aa index (since 1868) and the PC index (since 1948) as a proxy of the solar wind energy imparted to the magnetosphere. Prior to the 1940s the records of the NAO and the aa index were not closely connected, while after the 1940s their rhythms matched. We compare two distinctive periods with recent results on the long-scale reconstruction of solar activity. The shift in the NAO–aa interconnection can provide the explanation of a significant increase of solar activity after the 1940s. A strengthening of the interplanetary magnetic field leads to more intensive variations of the high-latitude ionospheric electric field that influences the atmospheric circulation.

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Correspondence to Renata Lukianova.

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Lukianova, R., Alekseev, G. Long-Term Correlation Between the Nao and Solar Activity. Sol Phys 224, 445–454 (2004). https://doi.org/10.1007/s11207-005-4974-x

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Keywords

  • Magnetic Field
  • Correlation Analysis
  • Solar Wind
  • Solar Activity
  • Recent Result