Fig. 3From: Solar flare effects on D-region ionosphere using VLF measurements during low- and high-solar activity phases of solar cycle 24a Variations in the GOES X-ray flux in W/m2 during the solar flares of May 13, 2013. b, c Variations in the amplitude and phase of the NLK and NPM signals during the May 13, 2013 solar flaresBack to article page