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Fig. 3 | Earth, Planets and Space

Fig. 3

From: Thermospheric wind variations observed by a Fabry–Perot interferometer at Tromsø, Norway, at substorm onsets

Fig. 3

X-component of 12-h ground-based magnetometer data collected at Tromsø station for all event times. Panels a-d indicate the measurements for events R1–R4, respectively. The dashed line in each panel shows the local substorm onset time near Tromsø we chose for each event. Local substorm onsets can be identified in a, c and d. The event time (local substorm onset time near Tromsø) shown by the text in each panel is in the format of local time (LT) at Tromsø (LT = universal time [UT] + 1 h)

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