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).
