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A Strong Instability in the Ion Cyclotron Frequency Range of the Upward Sheared Flow of the Oxygen Ions in Aurora

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Abstract

The dispersion relation of a new electrostatic ion cyclotron (IC) instability of a plasma with a sheared current of the oxygen ions along the magnetic field is investigated analytically and solved by numerical analysis. The considered case corresponds to the upward sheared flow of the oxygen ions in the aurora where the velocity shearing rate of ion current may be larger than the cyclotron frequency of O+ ion. In such a plasma, we found a new instability in the IC frequency range which develops in the sheared flow and can have a growth rate larger than O+ cyclotron frequency. This instability develops jointly with the known IC instability for the uniform current with a growth rate much less than O+ cyclotron frequency

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Acknowledgments

This work was funded by the National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (Grant Nos. NRF-2019R1A2C1088518 and NRF-2018R1D1A1B07050372) and BK21 FOUR, the Creative Human Resource Education and Research Programs for ICT Convergence in the 4th Industrial Revolution.

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Authors and Affiliations

  1. BK21 FOUR Information Technology, Pusan National University, Busan, 46241, Korea

    V. V. Mikhailenko

  2. Plasma Research Center, Pusan National University, Busan, 46241, Korea

    V. S. Mikhailenko

  3. Department of Electrical Engineering, Pusan National University, Busan, 46241, Korea

    Hae June Lee

Authors
  1. V. V. Mikhailenko
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  2. V. S. Mikhailenko
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  3. Hae June Lee
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Correspondence to V. V. Mikhailenko or Hae June Lee.

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Mikhailenko, V.V., Mikhailenko, V.S. & Lee, H.J. A Strong Instability in the Ion Cyclotron Frequency Range of the Upward Sheared Flow of the Oxygen Ions in Aurora. J. Korean Phys. Soc. 77, 936–939 (2020). https://doi.org/10.3938/jkps.77.936

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  • DOI: https://doi.org/10.3938/jkps.77.936

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