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Observational evidences of wave excitation and inverse cascade in a distant Earth foreshock region

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Abstract

The foreshock with nascent plasma turbulence is regarded as a fascinating region to understand basic plasma physical processes, e.g., wave-particle interactions as well as wave-wave couplings. Although there have been plenty of intensive studies on this topic, some key clues about the physical processes still lack observations. A relatively comprehensive case study with some new observations is presented in this work based on the WIND spacecraft observations. In this case, upstream energetic protons were drifting at tens of Alfvén speed with respect to the background plasma protons. When looking at the magnetic wave activities, we find the co-existence of high-frequency (0.1−0.5 Hz) large-amplitude right-hand polarized (RHP) waves and low-frequency (0.02−0.1 Hz) small-amplitude left-hand polarized (LHP) waves in the spacecraft (SC) frame. The observed anticorrelation between magnetic and velocity fluctuations along with the sunward magnetic field direction indicates that the low-frequency LHP waves in the SC frame are in fact the sunward upstream RHP Alfvénic waves in the solar wind frame. This new observation corroborates the applicability of theories about plasma non-resonance instability and inverse cascade to the foreshock region, where the downstream high-frequency RHP parent waves are excited by the upstream energetic protons through non-resonance instability and the low-frequency RHP daughter waves are generated by the parent waves due to nonlinear parametric instability. Furthermore, enhanced downstream energetic proton fluxes are inferred to result from scattering of the upstream protons by the nascent turbulent fluctuations. Therefore, some critical clues about the newborn turbulence in the foreshock are provided in this work.

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Acknowledgements

We thank the 3DP team and MFI team on WIND for sharing data with us. We thank Lynn Wilson III for providing the download of programs, which are used to analyze the PESA-High data. Jiansen He thanks C. H. K. Chen for helpful comments on the calibration of magnetic field data. The group from Peking University is supported by National Natural Science Foundation of China (Grant Nos. 41574168, 41874200, 41674171, 41774183, and 41421003).

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Authors and Affiliations

  1. School of Earth and Space Sciences, Peking University, Beijing, 100871, China

    Jiansen He, Die Duan, Xingyu Zhu & Linghua Wang

  2. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Limei Yan

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  1. Jiansen He
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Correspondence to Jiansen He.

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He, J., Duan, D., Zhu, X. et al. Observational evidences of wave excitation and inverse cascade in a distant Earth foreshock region. Sci. China Earth Sci. 62, 619–630 (2019). https://doi.org/10.1007/s11430-019-9330-3

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