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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 27 Sep 2019

Submitted as: regular paper | 27 Sep 2019

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A revised version of this preprint is currently under review for the journal ANGEO.

BD-IES Observation of Multi-Period Electron Flux Modulation Caused by Localized Ultra-Low Frequency Waves

Xingran Chen, Qiugang Zong, Hong Zou, Xuzhi Zhou, Li Li, Yixin Hao, and Yongfu Wang Xingran Chen et al.
  • Institute of Space Physics and Applied Technology, School of Earth and Space Sciences, Peking University, Beijing, China

Abstract. We present multi-period modulation of energetic electron flux observed by the BeiDa Imaging Electron Spectrometer (BD-IES) onboard a Chinese navigation satellite on October 13, 2015. Electron flux oscillations were observed at a dominant period of ~ 190 s in consecutive energy channels from ~ 50 keV to ~ 200 keV. Interestingly, flux modulations at a secondary period of ~ 400 s were also unambiguously observed. The oscillating signals at different energy channels were observed in sequence, with a time delay of up to ~ 900 s. This time delay far exceeds the oscillating periods, by which we speculate that the modulations were caused by localized ultra-low frequency (ULF) waves. To verify the wave-particle interaction scenario, we revisit the classic drift-resonance theory. We adopt the calculation scheme therein to derive the electron energy change in a multi-period ULF wave field. Then, based on the modeled energy change, we construct the flux variations to be observed by a virtual spacecraft. The predicted particle signatures well agree with the BD-IES observations. We demonstrate that the particle energy change might be underestimated in the conventional theories, as the Betatron acceleration induced by the curl of the wave electron field was often omitted. In addition, we show that azimuthally localized waves would notably extend the energy width of the resonance peak, whereas the drift-resonance interaction is only efficient for particles at the resonant energy in the original theory.

Xingran Chen et al.

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Xingran Chen et al.

Xingran Chen et al.


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Latest update: 04 Jun 2020
Publications Copernicus
Short summary
We present a new in-situ observation of energetic electron in space obtained by a newly available particle detector. In view of the characteristic signatures in the particle flux, we attribute the observational features to the drift-resonance wave-particle interaction between energetic electrons and multiple localized ULF waves. The scenario is substantiate by a numerical calculation based on the revised drift-resonance theory which reproduced the observed particle signatures.
We present a new in-situ observation of energetic electron in space obtained by a newly...