Time derivative of Electric Field Radiation Generated by Compact Intra Cloud Discharges

Abstract

Time derivatives of electric field radiation (dE/dt) generated by Narrow Bipolar Pulses (NBP) in two tropical thunderstorms are investigated and two types of pulse characteristic in dE/dt signal were identified. One type is with high-frequency chaotic noise bursts while the other type exhibit rather regular high-frequency bursts. According to the frequency spectrums of dE/dt signatures which are obtained using S-transformation, those two types of NBPs imply significant variation in higher frequency distribution. These variations in dE/dt signatures may be due to different physical behavior of compact intra-cloud discharge (CID).