Figure 1. Right block of panels: Plasma frequency by altitude versus local time for June 5, 2016. The vertical lines represent the HF pulses, which for reference are numbered in the bottom part of the panels. The continuous black lines represent the altitudinal point of reflection. The numbered arrows on the top shows the periods which the pulses were 5.1MHz, 5.125MHz, 5.115 MHz, 5.08MHz and 5.12 MHz (from 1 to 5, respectively). Left block of panels: The upper panel shows the power of the pulses during the experiment, the mid panel the airglow redline emission (6300) in Rayleigh (black) and its respective theoretical quiet time behavior (red) reconstructed by polynomial fitting using the lowest values for the periods of no pulses. Finally, the bottom panel shows residual obtained from the difference of the data minus the theoretical quiet time (black and red lines of the mid panel, respectively).