Fig. 6From: Continuous Doppler sounding of the ionosphere during solar flaresIonograms recorded by DPS-4 in Pruhonice just before the X-ray flare at 14:00 UT a and during the X-ray flare at 14:15 UT, b on 22 October 2014. Virtual reflection heights of ordinary L-O mode waves are by red, virtual reflection heights of extraordinary R-X mode waves are by green, and true reflection heights are by blackBack to article page