Preprints
https://doi.org/10.5194/angeo-2021-17
https://doi.org/10.5194/angeo-2021-17

  31 Mar 2021

31 Mar 2021

Review status: this preprint is currently under review for the journal ANGEO.

Reflection of low-frequency fast magnetosonic waves at the local two-ion cutoff frequency: Observation in the plasmasphere

Geng Wang1,2, Mingyu Wu1, Guoqiang Wang1, Sudong Xiao1, Irina Zhelavskaya3,4, Yuri Shprits3,4, Yuanqiang Chen2, Zhengyang Zou5, Zhonglei Gao6,2, Wen Yi2, and Tielong Zhang7 Geng Wang et al.
  • 1Harbin Institute of Technology, Shenzhen 518055, China
  • 2Key Laboratory of Geospace Environment , University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, China
  • 3Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany
  • 4Institute of Physics and Astronomy, University of Potsdam, Potsdam, Germany
  • 5State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macao 999078, PR China
  • 6School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410114, China
  • 7Space Research Institute, Austrian Academy of Sciences, Graz 8042, Austria

Abstract. We investigate the reflection of low-harmonic fast magnetosonic (MS) waves at the local two-ion cutoff frequency (fcutHe+). By comparing the wave signals of the two Van Allen Probes, a distinct boundary where wave energies cannot penetrate inward are found in time-frequency domain. The boundary is identified as the time series of local fcutHe+. For a certain frequency, there exists a spatial interface formed by fcutHe+, where the incident waves should be reflected. The waves with small incident angles are more likely to penetrate the thin layer where the group velocity reduces significantly, and being trapped in a period of several to tens of seconds before the reflection process complete. The cutoff reflection scenario can explain the intense outward waves observed by Probe-A. These results of MS reflection at fcutHe+ may help to predict the global distribution of MS waves and promote the understanding of wave-particle dynamics in the radiation belt.

Geng Wang et al.

Status: open (until 14 May 2021)

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Geng Wang et al.

Geng Wang et al.

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Short summary
We investigate the reflection of MS waves at the local two-ion cutoff  frequency in the outer plasmasphere, which is  rarely reported. The observed wave signals demonstrate the reflection of at the local two-ion cutoff  frequency.  From  simulations,  the waves  with small incident angles are more likely to penetrate the thin layer where the group velocity reduces significantly before reflection. These results may help to predict the global distribution of MS waves.