Abstract
The electric field changes, the magnetic field changes, and UHF radiations were observed during the rocket-triggered lightning experiment using the 4 channels transient memory of its sampling frequency of 1 MHz. The sensors were a flat disk antenna, a loop antenna, and a disk corn antenna respectively. Concerning the initiation of the electric and magnetic field changes, a remarkable discrepancy between the rocket-triggered lightning to the tower and the one to the ground is noticed. That is, the former is initiated by a bipolar pulse of a large amplitude. On the other hand, the amplitude of the latter increases gradually. Preceding such kind of changes, UHF isolated pulses were also recorded. The statistics of the UHF isolated pulses are presented.
