Fig. 2.From: An error analysis on nature and radar system noises in deriving the phase and group velocities of vertical propagation wavesThe MU radar echo-power and the associated distribution at 398 km altitude. (a) Echo-power (thin line) and its running mean (bold line) with a 1-hour window (i.e. °30 min) and shifting by 1 minute. (b) The Gaussian distribution of the echo-power.Back to article page