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Fig. 1. | Earth, Planets and Space

Fig. 1.

From: Long-term behavior of annual and semi-annual Sq variations

Fig. 1.

The LAT-LT diagram of the equivalent current systems for the stationary, annual and semi-annual component of the Sq variations for a high solar-activity period (150 ≤ F10.7 < 250), as originally derived by Yamazaki et al. (2009). The top panel shows the equivalent current system for the stationary component. The middle four panels show the equivalent current systems for the annual component for the March equinox (DOY = 80, upper left), the June solstice (DOY = 172, upper right), the Spring equinox (DOY = 264, lower left) and the December solstice (DOY = 355, lower right), while the bottom four panels show the equivalent current systems for the semi-annual component.

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