あけぼの衛星による HIPAS/VLF 変調波観測協同実験

概要

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This paper reports the results of collaborative experiments between UCLA and Akebono VLF team, using HIPAS HF transmitter and Akebono satellite. In these experiments, the HIPAS transmitter amplitude modulated by a VLF frequency creates a VLF current in the ionospheric heated region, from where the VLF waves are radiated toward the ground and to the magnetosphere. In 1989,two campaigns were made. While the VLF waves associated with HIPAS transmission were often observed on the ground, at the satellite the wave was observed only once. This rare chance of signal detection at the satellite means that the VLF waves are not always isotropically radiated from the current in the lower ionosphere. The signal intensity observed at the satellite was a reasonable value as compared with that observed on the ground.
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