Volume 40 Issue 4
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WEI Chao, DAI Lei. Observations of ULF Waves at the Late Recovery Phase of Magnetic Storm[J]. Chinese Journal of Space Science, 2020, 40(4): 479-492. doi: 10.11728/cjss2020.04.479
Citation: WEI Chao, DAI Lei. Observations of ULF Waves at the Late Recovery Phase of Magnetic Storm[J]. Chinese Journal of Space Science, 2020, 40(4): 479-492. doi: 10.11728/cjss2020.04.479

Observations of ULF Waves at the Late Recovery Phase of Magnetic Storm

doi: 10.11728/cjss2020.04.479
  • Received Date: 2019-04-09
  • Rev Recd Date: 2019-10-15
  • Publish Date: 2020-07-15
  • Two ULF wave events on 25 Jan. and 22 Feb. 2016 are studied by using the combined observations of Radiation Belt Storm Probes (RBSP) and Magnetospheric Multiscale (MMS). Both events occurred in the late recovery phase of the magnetic storm, and both fluctuations occurred in the area between morning and noon. The two events observed by RBSP occurred in the low L-shell (4.7~5.8), and the two events observed by MMS occurred in the high L-shell (8.0~14.2). In the high L-shell, the ULF wave is dominated by toroidal mode, and it is the first harmonic along the field line. In the low L-shell, the ULF wave is dominated by the poloidal wave, and it is the second harmonic along the field line. In addition, by comparing the absolute values of ∂f/∂w|μ,L and (dL)/(dW)(∂f)/(∂L)|μ,W, the bump-on-tail ion distribution and inward gradient of ion phase space density together provide free energy for the wave through N=1 bounce resonance. According to the analysis of these two cases, about 10keV ions exist with the waves and provide free energy for the generation of waves at the late recovery phase of the magnetic storm.

     

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