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- W4221017648 abstract "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}(hereafter Burton equation), and by cite{OBrien2000}(hereafter OM equation) to evaluate whether textbf{two equations} can correctly estimate the intensities of GGSs. The results show that the intensities of most GGSs estimated by OM equation are much smaller than the observed intensities. The RMS error between the intensities estimated by OM equation and the observed intensities is textbf{203} nT, implying that the estimated storm intensity deviates significantly from the observed one. The RMS error between the intensities estimated by Burton equation and the observed intensities is 130.8 nT. The relative error caused by Burton equation for the storms with intensities $Delta$SYM-H$<$-400 nT is larger than 27%, implying that the absolute error will be large for the storms with $Delta$SYM-H$<$-400 nT. The results indicate that the two equations cannot work effectively in the estimation of GGSs. On the contrary, the intensity of a GGS estimated by the empirical formula created by cite{WangCB2003} can always be very close to the observed one if we select the right weight for solar wind dynamic pressure, proving that solar wind dynamic pressure is an important factor for GGS intensity, but it is overlooked in the ring current injection terms of Burton equation or OM equation. This is the reason why the two equations cannot work effectively in the estimation of GGSs." @default.
- W4221017648 created "2022-04-03" @default.
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- W4221017648 date "2022-03-01" @default.
- W4221017648 modified "2023-09-28" @default.
- W4221017648 title "Can We Estimate the Intensities of Great Geomagnetic Storms (ΔSYM-H ≤ −200 nT) with the Burton Equation or the O’Brien and McPherron Equation?" @default.
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- W4221017648 doi "https://doi.org/10.3847/1538-4357/ac50a8" @default.
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