A Proposal for Modification of Plasmaspheric Electron Density Profiles Using Characteristics of Lightning Whistlers

DOI Web Site 参考文献31件 オープンアクセス
  • Desy Purnami Singgih Putri
    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
  • Yoshiya Kasahara
    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
  • Mamoru Ota
    Department of Electrical and Control Systems Engineering, National Institute of Technology, Toyama College, Toyama 939-8630, Japan
  • Shoya Matsuda
    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
  • Fuminori Tsuchiya
    Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
  • Atsushi Kumamoto
    Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
  • Ayako Matsuoka
    Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
  • Yoshizumi Miyoshi
    ISEE, Nagoya University, Nagoya, Aichi 464-8601, Japan

抄録

<jats:p>Reconstruction of reliable plasmaspheric electron density profiles is important for understanding physical processes in the plasmasphere. This paper proposes a technique that can be applied to correct the plasmaspheric electron density profiles using ray tracing by scrutinizing dispersion analyses of lightning whistlers. The Global Core Plasma Model and the International Reference Ionosphere were introduced as a reference electron density profile. Modifications of this electron density profile were then proposed to satisfy the dispersion characteristics of lightning whistlers measured by satellites in the plasmasphere. We first introduce two kinds of functions to modify the electron density: constant and linear, the linear function is more adequate. We applied our method to two lightning whistler events on 14 August 2017, measured by the Plasma Wave Experiment/Waveform Capture aboard the Arase satellite, and analyzed the dispersion of the observed lightning whistlers. We show how the density modification affects the delay time of the ray path and satisfies the dispersion characteristics under the appropriate adjustments.</jats:p>

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