Long-Term Cosmic Ray Variability and the CME-Index

Table 1

Cross-correlation coefficients and the corresponding time lags for the entire period (1996–2011).

Indices	Correlation coefficients (𝑟); (95% significance level)	Time lags (months)
Sunspot number 𝑅𝑧	−0.91 ± 0.01	+14
Coronal mass ejections index 𝑃𝑖	−0.84 ± 0.01	0
Interplanetary magnetic field IMF	−0.86 ± 0.01	+1
Heliospheric current sheet HCS	−0.82 ± 0.01	+8