Open Access

Table 1

Correlation coefficients and regression results for Kp-PC relations. Epoch 1998–2018.

Parameter PCC PCN PCS PCA1) PCW2) PCU3) mV/m
Correlation 0.815 0.758 0.770 0.797 0.795 0.736
Slope (S) 0.986 0.813 0.843 0.903 0.902 0.764 (mV/m)−1
Intercept (Kp0) 0.847 1.122 1.052 1.025 1.021 1.145

Average of available PCN and PCS values.


Winter values of PCN or PCS index values.


Summer values of PCN or PCS index values.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.