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

Fig. 1

From: Thermospheric wind response to a sudden ionospheric variation in the trough: event at a pseudo-breakup during geomagnetically quiet conditions

Fig. 1

Measurements on 2018 February 20–21 of a, b IU and IL indices made of IMAGE magnetometers segmented into three areas (poleward (blue; 74.50–78.92°N), near (orange; 68.02–71.09°N) and equatorward (purple; 58.26–66.90°N) side of Tromsø (69.58°N)), c, d keograms made using the all-sky camera (558 nm) at Longyearbyen and Abisko, respectively, and e, f zonal and meridional components (positive eastward and northward, respectively) of the thermospheric wind velocity measured with the FPI at Tromsø (630 nm). Post-integration of 20 FPI fringe images, corresponding to a 50 min time resolution of the wind vector (black solid circles), was applied to the original images taken every 2.5 min. The error bars for each wind component (± 1σ) are shown in shading. HWM winds at 250-km altitude are overlaid (green curves). The Kp index every 3 h is marked in (a)

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