<論文>じきけん/サイプル局信号による波動-粒子相互作用の実験

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In situ measurements of both energetic particles and VLF waves have been carried out in a joint program involving the Japanese satellite EXOS-B and the Siple Station VLF transmitter. A general description of the experiment is given as well as some results concerning wave-particle correlations. Telemetry data aquisition was made by NASA tracking stations during summer in 1979 and during the succeeding winter. This report describles mainly the results of the summer experiment. The Siple signal was detected on about 32% of the observed passes. Siple triggered emissions (ASE) were observed on five passes concentrated in a period from August 14 to 18, while it was geomagnetically quiet after a large magnetic storm on August 13. There were two types of Siple ASE; one is due to a direct triggering, which is normally found in the ground observation, and the other is one triggered by echoing signals, which is not popularly found on the ground. Siple signals triggered ASE when the signal frequency was around half the equatorial cyclotron frequency and electron flux was large for all observed energy channels. The observed delay time of the Siple signal from the transmitter to the satellite can be interpreted by either ducted or non-ducted propagation.
宇宙航空研究開発機構の論文