Fig. 3From: Geomagnetic activity dependence and dawn-dusk asymmetry of thermospheric winds from 9-year measurements with a Fabry–Perot interferometer in Tromsø, NorwayTime series of the a meridional and b zonal components of all available FPI measurements (gray dots) along with the quiet-time wind, which is the same as the mean wind with SME ≤ 40 nT (yellow circles). MLT is labeled at the top barBack to article page