National Natural Science Foundation of China(41374168,41521063 ,&, 41174140)
Key Grant Project of Chinese Ministry of Education(2042015kf0169)
Program for New Century Excellent Talents in University(NCET-13-0446)
We acknowledge the Van Allen Probes data from the EMFISIS instrument obtained from
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Figure 1
Space environment indexes during October 6–13, 2014, provided by OMNI web. (a) Solar dynamic pressure (b) AE index. (c) Sym-H index. The first arrow in panel (a) indicates the Sudden Storm Commencement (SSC). The solid red rectangle denotes the occurrence interval of electromagnetic oxygen cyclotron harmonic waves.
Figure 2
(a) Electron density profile during the inbound trajectory of the Van Allen Probe A orbit between 21:00 UT and 22:20 UT on October 9, 2014. (b) Power spectral density of one perpendicular component (ΔB
Figure 3
PSD of left-hand, right-hand, and compressional components of the perturbed magnetic field shown by solid blue, red, and black curves, respectively. The dashed black vertical lines denote the equatorial oxygen cyclotron harmonic frequencies (
Figure 4
Average PSD, power weighted average ellipticity and power weighted average WNA of different subintervals shown, respectively in panels (a)–(c). The four straight lines are shown in the same wave as in