The geoeffective, southward IMF (\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bs) given in the GSM reference frame as nature presents is compared with that based on idealized, spiral IMF. We obtained\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bsand\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bssorted by the IMF polarity (\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bsfields) from in situ data at a high 16-second resolution. Idealized IMF is derived by omitting the fluctuation of the IMF in the GSEQ Z-direction. Results are: the absolute value of realistic\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bsis larger than the one from idealized IMF; realistic\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bspolarity fields exist in all seasons, while those from idealized IMF exist only around spring/fall when the IMF points toward/away from the Sun; idealized\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bsfields match the predictions of the Russell–McPherron (RM) model almost ideally. The present study has resolved the issue related to the patterns and absolute values of the observed\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bsfields and those from the RM model that assumes an idealized IMF. It confirms that\documentclass[12pt]{minimal}
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				\begin{document}$$B_{z,\text {GSEQ}}$$\end{document}Bz,GSEQplays a crucial role for\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bs. Finally, it paves a way to properly link the variations seen in geomagnetic activity with the pattern of the measured\documentclass[12pt]{minimal}
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				\begin{document}$$B_\text {s}$$\end{document}Bsfields.