Effects of tropical cyclones on the VLF atmospherics observed from low latitude receiving stations

The response of electric field intensity of VLF radio atmospherics during two tropical cyclones Fani (May 2019) and Amphan (May 2020) has been summarized in this paper. The amplitudes of VLF radio atmospherics (or VLF sferics) received at Cooch Behar (CHB) and Kolkata (CUB) at three discrete frequencies (4 kHz, 7 kHz, and 9 kHz) showed distinct variations with respect to the reference level during the two cyclonic storms, which is explained using the electrical structure and distribution of cloud-to-ground lightning associated with the cyclones.