Fig. 8

Average VLF amplitude and phase perturbations of selected flare power bins for NLK and NWC as functions of solar flare X-ray flux measured in dB relative to 1 µW/m2 in the 0.1–0.8 nm band, for low-solar activity conditions (red points and corresponding red best-fit curves) and moderate-solar activity conditions (blue points and corresponding blue best-fit curves)