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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Post-midnight purple arc and patches appeared on the high latitude part of the auroral oval: Dawnside counterpart of STEVE?

Fig. 4

Measurements by Swarm A a–d and B (e–f. (a, e East–west ion drift speed. The positive value indicates the eastward flow. (b, f East–west magnetic variation. The positive gradient corresponds to the upward FAC. The dipole component was subtracted by the IGRF model. (c, g Plasma temperature. (d, h Plasma density. The estimated purple and green arcs regions are hatched in purple and green, respectively

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