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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

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

Fig. 1

Solar wind and geomagnetic conditions during Event 1. a H component of the SYM index from 25th to 30th December 2021. The dashed lines mark the period shown in panels b–g. b Intensity (black) and z component (red) of the interplanetary magnetic field (IMF). c Speed of the solar wind (SW). d Solar wind density. e Solar wind dynamic pressure. f SuperMAG SMU and SML indices: upper (black) and lower (red). g North–south keogram from dusk to dawn derived from the digital camera installed in Tromsø, Norway

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