VLF wave-wave interaction experiments in the magnetosphere

VLF wave-wave interaction experiments were carried out by injecting various forms of VLF pulses into the magnetosphere from a 21.2 Km dipole antenna at Siple, Antarctica. This report is divided into three parts. In the first part, simulations of VLF pulses propagating in the magnetosphere are carried out. The results show that the leading edge of a VLF pulse is distorted sufficiently when it arrives at the interaction region to alter the details of the wave-particle interaction process in the magnetosphere. In the second part, it is found for the first time that a 10 ms gap in a triggering wave can induce emission, which may then interact with the post-gap signals. In the third part, sideband triggering is reported for the first time. Sidebands are generated by frequency-shift-key modulation techniques.