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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: High-latitude thermospheric wind study using a Fabry–Perot interferometer at Tromsø in Norway: averages and variations during quiet times

Fig. 3

Two thermospheric wind measurements (events R1 and R2) during quiet times, whose zonal wind showed large deviation (> 100 m/s) from quiet-time average. a, f Zonal wind. b, g Meridional wind. c, h X component of magnetometer data at Tromsø and Bear Island. d, i AE and AL indices. e, j IMF By and Bz in GSM coordinates. The blue rectangle indicates the quiet-time period, namely Kp ≤ 1+ for 3–6 h before, with no substorm or auroral activity being identified above Tromsø. The red rectangle indicates the interval of the deviated measurements. The light blue curve indicates the quiet-time average wind, and the dark-gray rectangles indicate times of cloud

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