Skip to main content
Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

Time series of a IU, b IL, c keogram made of the all-sky camera at Longyearbyen (but from 72 to 77.5°N) and d zonal component of the FPI-measured neutral wind (black dots) and ion velocity from the Dynasonde (orange dots) at Tromsø from 17 to 21 UT on 2018 February 20. Post-integration of 4 FPI fringe images was applied, corresponding to a 10-min time resolution. The mean error of the neutral wind for the selected four hours is illustrated by a black vertical bar. Individual errors of the ion velocity are marked by orange vertical bars. The green curve represents the HWM zonal wind at 250-km altitude. The time of the Swarm pass over Scandinavia is marked by a vertical light blue bar, which is drawn from 18:40:18 to 18:42:08 UT, corresponding to the shifted geographical latitude from 67 to 74°N (see Fig. 4c). The time interval from 18:15 to 19:31 UT is separated into three groups, highlighted in purple, yellow, and light blue. These colors are also applied in Fig. 6 to highlight individual time intervals

Back to article page