Long-Term Cosmic Ray Variability and the CME-Index

Table 2

Standard deviation for different models during the solar cycles 23 and 24 and in total examined period. Coefficients 𝛼_i factors are also given in the first column, respectively, for each variable.

Model parameters	Solar cycle 23; (May 1996–Dec 2008)	Solar cycle 24; (Jan 2009–Oct 2011)	Total; (Jan 1996–Oct 2011)
𝑅𝑧, 𝑃𝑖, IMF, HCS; (2.42, 0.54, 54.08, 2.02)	6.98%	4.79%	6.69%
𝑅𝑧, 𝑃𝑖 (width >30°), IMF, HCS; (2.36, 0.91, 52.51, 2.12)	6.63%	4.13%	6.27%