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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Eastward-expanding auroral surges observed in the post-midnight sector during a multiple-onset substorm

Fig. 5

Ionospheric equivalent current system associated with EEASs. a Temporal evolution of the ionospheric equivalent currents for the first EEAS event, b second event, and c third event. The ionospheric equivalent current was derived from the magnetic perturbations associated with the EEASs by a 90° clockwise rotation and is plotted with the auroral images mapped onto a horizontal plane at a 105-km altitude

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