Whistler Wave Trapping in a Narrow Density Trough

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  • Sugai Hideo
    Department of Electrical Engineering, Nagoya University
  • Ido Kazuo
    Department of Electrical Engineering, Nagoya University
  • Niki Hiroshi
    Department of Electrical Engineering, Nagoya University
  • Takeda Susumu
    Department of Electrical Engineering, Nagoya University
  • Mima Kunioki
    Institute of Laser Engineering, Osaka University

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  • Whistler Wave Trapping in a Narrow Dens

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The propagation of linear whistler waves is investigated in a plasma where the field-aligned density trough is produced without electron heating, in the artificial way different from previous experiments. Whistler waves are observed to be trapped in the narrow trough of width 2d\lesssimλ⁄⁄ (parallel wave length). The phase and amplitude profile of ducted whistlers is measured along and across the trough, controlling the density depth Δne arbitrarily. The transverse amplitude decay outside the trough is found to become maximum at critical frequency. The measured transverse decay-length as well as the wave dispersion is in quantitative agreement with the trapping theory.

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