Cosmic Rays and Solar Coronal Emissions: Cross-Correlations of the Time Series

Abstract

The cosmic-ray (CR) time series were compared with the green 530.3 nm coronal emission line intensity over the period 1951–2003. There is a clear asymmetry in the cross-correlation between the cosmic rays and green emission corona for the even- and odd-numbered solar cycles, where a time lag is ranging between 0 and 380 days. While over the period 1954–1964 and 1978–1985 the time lag is above 200 days, over the period 1965–1976 and 1986–1995 the time lag is below 130 days. A possible reason for the lag asymmetry is discussed. The cross-correlations between the cosmic rays and Wolf sunspot number over the period 1951–2003 is also presented.