Fig. 2
From: Statistical investigation of gravity wave characteristics in the ionosphere
Distribution of selected GW characteristics for the period July 2014–June 2015 (solar maximum) assuming L-O mode (blue) and R-X mode (orange) signals. a observed velocities vo, b wind rest frame velocities v, c observed azimuth difference ϕo between vo (vHo) and horizontal velocity w of neutral winds, d azimuth difference ϕ between v (vH) and horizontal velocity w of neutral winds, e observed azimuth, f azimuth