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Fig. 6 | Earth, Planets and Space

Fig. 6

From: Proton auroras during the transitional stage of substorm onset

Fig. 6

THEMIS ASI images showing substorm onset on 2016-12-09. A few selected auroral images from ATHA ASI (lower-latitude one) and FSMI ASI (higher-latitude one) showing the substorm onset on 2016-12-09. An emission altitude of 100 km is used here based upon a triangulation technique of the arc in the overlapping area of two ASIs. A blue line denotes the FESO scan meridian. The images are indexed to facilitate referene in the text

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