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SCIENCE CHINA Earth Sciences, Volume 60 , Issue 7 : 1310-1316(2017) https://doi.org/10.1007/s11430-016-9024-3

Oxygen cyclotron harmonic waves observed using Van Allen Probes

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  • ReceivedNov 15, 2016
  • AcceptedFeb 28, 2017
  • PublishedApr 12, 2017

Abstract


Funded by

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)


Acknowledgment

We acknowledge the Van Allen Probes data from the EMFISIS instrument obtained from http://emfisis.physics. uiowa.edu/data/index and the EFW instrument obtained from http:// www.space.umn.edu/rbspefw-data/. The data of electron density from the Van Allen Probes are provided by W.S. Kurth. The solar dynamic pressure, AE index and SYM-H index data are provided by Space Physics Data Facility at http://omniweb.gsfc.nasa.gov/. This work was supported by the National Natural Science Foundation of China (Grant Nos. 41374168, 41521063 & 41174140), Key Grant Project of Chinese Ministry of Education (Grant No. 2042015KF0169) and Program for New Century Excellent Talents in University (Grant No. NCET-13-0446).


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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 (ΔBt1) of the perturbed magnetic field vector in the field-aligned coordinate (FAC) system. (c) Wave ellipticity. (d) Wave normal angle (WNA). The solid and dashed black curves denote the local helium and oxygen ion gyrofrequencies, respectively. The dashed blue curves in panel (b) denote the equatorial oxygen ion cyclotron harmonic frequencies. The two solid red straight lines denote the wave intense interval, whereas the two solid blue straight lines denote the time interval of the fine structured harmonic emissions.

  • 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 (f=1–8fO+_eq).

  • 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 Figure 2. Note that the peak in the second harmonics (blue curves in panel (a)) just in the left side of the first red vertical line is due to the satellite spin harmonics noise since the second subinterval involves these spin harmonic frequencies.