Fig. 1From: Auroral streamer and its role in driving wave-like pre-onset auroraTime sequences of auroral activities from ASIs [the left station is Fort Simpson (FSIM), and the right station is Fort Smith (FSMI)]. The black dot in a–e is the footpoint of THEMIS-A from AM03 model. f The zoom-in auroral snapshot at 08:32:06 UT; the yellow, red, and blue dots are identified by eye to represent the locations of three identical auroral patchesBack to article page