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Earth, Planets and Space
Figure 2 | Earth, Planets and Space

Figure 2

From: Does the South Atlantic Anomaly influence the ionospheric Sq current system? Inferences from analysis of ground-based magnetic data

Figure 2

The Sq source in the form of a current function. The current system is shown for six time instances (UTC = 4:00, 8:00, 12:00, 16:00, 20:00, 24:00) for 1990-05-15 with the solar terminator of the respective day on top (blue shade). Starting on the top right plot, the Sq current system travels westwards during the 24-h UTC day. The solid black lines show the dip equator from the IGRF model for 1990 (Finlay et al. 2010). Dashed lines represent ±6° and ±60° dip latitude. Only observatories in between are used for the Sq source determination to avoid effects from polar and equatorial electrojets. Units are given in kA.

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