Can we estimate the intensities of great geomagnetic storms($\Delta$SYM-H$\le -$200 nT) by Burton equation or by O'Brien and McPherron equation?

Ming-Xian Zhao, Gui-Ming Le, Jianyong Lu

We input solar wind parameters responsible for the main phases of 15 great geomagnetic storms (GGSs: $\Delta$SYM-H$\le -$200 nT) into the empirical formulae created by \cite{Burton1975}(…