EGU2020-19284, updated on 15 May 2024
https://doi.org/10.5194/egusphere-egu2020-19284
EGU General Assembly 2020
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Global Morphology of Lower-band Chorus Wave Intensity Reconstructed Using multi-year POES Electron Measurements

Yang Zhang1,2, Binbin Ni1, Xudong Gu1, Yuri Shprits2, Song Fu1, Xing Cao1, and Zheng Xiang1
Yang Zhang et al.
  • 1Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan, Hubei, China
  • 2Section 2.8 Magnetospheric Physics, German Research Centre for Geosciences, Potsdam, Germany

Magnetospheric chorus is known to play a significant role in the acceleration and loss of radiation belt electrons. Interactions of chorus waves with radiation belt particles are commonly evaluated using quasi-linear diffusion codes that rely on statistical models, which might not accurately provide the instantaneous global wave distribution from limited in-situ wave measurements. Thus, a novel technique capable of inferring wave amplitudes from POES particle measurements, with an extensive coverage of L-shell and magnetic local time, has been established to obtain event-specific, global dynamic evolutions of chorus waves. This study, using 5 years of POES electron data, further improves the technique, and enables us to subsequently infer the chorus wave amplitudes for all useful data points (removing the electrons which were in the drift loss cone) and to construct the global distribution of lower-band chorus wave intensity. The results obtained from the improved technique reproduce Van Allen Probes in-situ observations of chorus waves reasonably well and reconstruct the major features of the global distribution of chorus waves. We demonstrate that such a data-based, dynamic model can provide near-real-time estimates of chorus wave intensity on a global scale for any time period when POES data are available, which cannot be obtained from in-situ wave measurements by equatorial satellites alone, but is crucial for quantifying the  dynamics of the radiation belt electrons.

How to cite: Zhang, Y., Ni, B., Gu, X., Shprits, Y., Fu, S., Cao, X., and Xiang, Z.: Global Morphology of Lower-band Chorus Wave Intensity Reconstructed Using multi-year POES Electron Measurements, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-19284, https://doi.org/10.5194/egusphere-egu2020-19284, 2020.