a)–d) Comparison of the observed solar wind parameters with the calculated values. The observed data are inicated by the thick gray line, calculated values (using linear regression parameters a and b as given in Table 2) are drawn by thin black line, and the amplitude-optimized “predicted” values (using linear regression parameters a_corr and b_corr as given in Table 2) are drawn by thick black line. e) − f) Comparison of the measured values of the geomagnetic indices Dst and Ap with the calculated values. The observed data are delineate by the thick gray line, values calculated for the N-polarity CHs are drawn by thick-dashed line, and S-polarity CHs are indicated by thick-black line. See text for details.