On long-term variations of solar wind parameters and solar activity

TL;DR

This study analyzes long-term variations in solar wind parameters and solar activity, revealing century-scale trends and potential links to Earth's climate, with implications for understanding solar influence on climate change.

Contribution

It provides a comprehensive comparison of solar wind and geomagnetic activity variations with solar cycles over multiple decades, highlighting century-scale non-monotonous trends.

Findings

Long-term solar wind speed and scintillation index vary with solar cycles.

Century-scale non-monotonous trends exist in scintillation parameters at middle and high heliolatitudes.

Correlations are observed between Wolf's numbers and anomalies in air temperature over several centuries.

Abstract

Comparison is carried out of the long term variation of the year averaged solar wind speed and interplanetary scintillation index with the variations of Wolf's numbers and A_P indexes of geomagnetic activity for the data of 20-24 solar activity cycles. It is shown that the slow non-monotonous trend in the scintillation parameters at middle and high heliolatitudes exists with the typical scale of order of century cycle. Correlation between the variations of Wolf's numbers and anomalies of the air temperature is analyzed for long data series from 1610 up to the present time. Possible application of the results to the global climate problem is discussed.