1970 年 29 巻 6 号 p. 1597-1608
Wave-wave coupling among ion waves is investigated, experimentally and theoretically. When two ion waves of different frequencies of f1 and f2 are excited by one grid, the signals of the harmonic (2f1) and f1−f2 are detected by another grid. They are found to grow spatially in some region, on the contrary to those of f1 and f2 which decrease monotonously in the region. The growing regions of the harmonic and f1−f2 are in accord with those obtained from the theory of the wave-wave coupling among ion waves. The propagation of small-amplitude wave under the large-amplitude wave and the propagation of ion wave with large-amplitude are also investigated.
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