超高層における電波現象の直接観測

概要

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Direct observations of radio phenomena in the ionosphere and exosphere by means of space vehicles have several merits. Among these, observation of the phenomena which do occur only in these spaces, can not be achieved without the space vehicles. Whistlers which are affected by the effects of ions, whistlers propagated in the non-ducted paths, ion cyclotron whistlers, lower hybrid resonance noise, electrostatic ion waves are typical examples of such phenomena. In this paper, first, the propagation modes in the magnetoactive cold and hot plasma are briefly introduced. Importance of the effects of ions on the VLF and ELF propagation modes is stressed. Several phenomena relating these ion effects which were observed with satellite borne receivers are introduced. Other radio wave experiments by using satellite and rockets are reviewed and our future experiments by means of the Japanese sounding rockets are proposed.
宇宙航空研究開発機構の論文