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Table 3.

Summary of regression results (global geomagnetic data).

Index Function R 2
SSN linear 0.27
ln 0.19
poly 0.35
hyp 0.20
exp 0.26
Ap mean linear 0.078
ln 0.082
poly 0.123
hyp 0.081
exp 0.069
Dst mean linear 0.05
ln 0.04
poly 0.23
hyp 0.04
exp 0.04
Annual no. of days with Ap ≥ 40 linear 0.06
poly 0.14
exp 0.05
Annual no. of days with Dst ≤ −40 linear 0.08
poly 0.22
exp 0.07

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