Fig. 9From: Lightning evolution and VLF perturbations associated with category 5 TC Yasa in the South Pacific RegionTemporal variation of the ionospheric Wait parameters, H′ (red) and β (blue), associated with the daytime NPM signal perturbation detected on 17 December 2020 at 18:00 UT to 18 December at 6:00 UT during TC YasaBack to article page