Nonlinear Drift Resonance Between Charged Particles and Ultralow Frequency Waves: Theory and Observations

DOI HANDLE Web Site Web Site 被引用文献2件 参考文献38件
  • Li Li
    School of Earth and Space Sciences Peking University Beijing China
  • Xu‐Zhi Zhou
    School of Earth and Space Sciences Peking University Beijing China
  • Yoshiharu Omura
    Research Institute for Sustainable Humanosphere Kyoto University Kyoto Japan
  • Zi‐Han Wang
    School of Earth and Space Sciences Peking University Beijing China
  • Qiu‐Gang Zong
    School of Earth and Space Sciences Peking University Beijing China
  • Ying Liu
    School of Earth and Space Sciences Peking University Beijing China
  • Yi‐Xin Hao
    School of Earth and Space Sciences Peking University Beijing China
  • Sui‐Yan Fu
    School of Earth and Space Sciences Peking University Beijing China
  • Margaret G. Kivelson
    Department of Earth, Planetary, and Space Sciences University of California Los Angeles CA USA
  • Robert Rankin
    Department of Physics University of Alberta Edmonton Alberta Canada
  • Seth G. Claudepierre
    Space Science Applications Laboratory The Aerospace Corporation El Segundo CA USA
  • John R. Wygant
    School of Physics and Astronomy University of Minnesota, Twin Cities Minneapolis MN USA

書誌事項

公開日
2018-09-12
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2018gl079038
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>In Earth's inner magnetosphere, electromagnetic waves in the ultralow frequency (ULF) range play an important role in accelerating and diffusing charged particles via drift resonance. In conventional drift resonance theory, linearization is applied under the assumption of weak wave‐particle energy exchange so particle trajectories are unperturbed. For ULF waves with larger amplitudes and/or durations, however, the conventional theory becomes inaccurate since particle trajectories are strongly perturbed. Here we extend the drift resonance theory into a nonlinear regime, to formulate nonlinear trapping of particles in a wave‐carried potential well, and predict the corresponding observable signatures such as rolled‐up structures in particle energy spectrum. After considering how this manifests in particle data with finite energy resolution, we compare the predicted signatures with Van Allen Probes observations. Their good agreement provides the first observational evidence for the occurrence of nonlinear drift resonance, highlighting the importance of nonlinear effects in magnetospheric particle dynamics under ULF waves.</jats:p>

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