Fig. 47

(a) The equivalent lunar current system at new moon, averaged over the winters without a stratospheric sudden warming during 1958–2007. (b) The equivalent lunar current system at new moon, averaged over stratospheric sudden warming events during 1958–2007. (c) The equivalent solar current system averaged over the winters without a stratospheric sudden warming during 1958–2007. (d) The equivalent solar current system averaged over stratospheric sudden warming events during 1958–2007. The contour intervals are 2.5 kA for the lunar currents and 10 kA for the solar currents. From Yamazaki (2014)