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Whistler-mode chorus waves at Mars

Author

Listed:
  • Shangchun Teng

    (University of Science and Technology of China
    University of Science and Technology of China
    Tongji University)

  • Yifan Wu

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Yuki Harada

    (Kyoto University)

  • Jacob Bortnik

    (University of California at Los Angeles)

  • Fulvio Zonca

    (Center for Nonlinear Plasma Science and C.R. ENEA Frascati
    Zhejiang University)

  • Liu Chen

    (Zhejiang University
    University of California)

  • Xin Tao

    (University of Science and Technology of China
    University of Science and Technology of China)

Abstract

Chorus waves are naturally occurring electromagnetic emissions in space and are known to produce highly energetic electrons in the hazardous radiation belt. The characteristic feature of chorus is its fast frequency chirping, whose mechanism remains a long-standing problem. While many theories agree on its nonlinear nature, they differ on whether or how the background magnetic field inhomogeneity plays a key role. Here, using observations of chorus at Mars and Earth, we report direct evidence showing that the chorus chirping rate is consistently related to the background magnetic field inhomogeneity, despite orders of magnitude difference in a key parameter quantifying the inhomogeneity at the two planets. Our results show an extreme test of a recently proposed chorus generation model and confirm the connection between the chirping rate and magnetic field inhomogeneity, opening the door to controlled plasma wave excitation in the laboratory and space.

Suggested Citation

  • Shangchun Teng & Yifan Wu & Yuki Harada & Jacob Bortnik & Fulvio Zonca & Liu Chen & Xin Tao, 2023. "Whistler-mode chorus waves at Mars," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38776-z
    DOI: 10.1038/s41467-023-38776-z
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    References listed on IDEAS

    as
    1. Richard M. Thorne & Binbin Ni & Xin Tao & Richard B. Horne & Nigel P. Meredith, 2010. "Scattering by chorus waves as the dominant cause of diffuse auroral precipitation," Nature, Nature, vol. 467(7318), pages 943-946, October.
    2. Mitsunori Ozaki & Yoshizumi Miyoshi & Kazuo Shiokawa & Keisuke Hosokawa & Shin-ichiro Oyama & Ryuho Kataoka & Yusuke Ebihara & Yasunobu Ogawa & Yoshiya Kasahara & Satoshi Yagitani & Yasumasa Kasaba & , 2019. "Visualization of rapid electron precipitation via chorus element wave–particle interactions," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    3. R. M. Thorne & W. Li & B. Ni & Q. Ma & J. Bortnik & L. Chen & D. N. Baker & H. E. Spence & G. D. Reeves & M. G. Henderson & C. A. Kletzing & W. S. Kurth & G. B. Hospodarsky & J. B. Blake & J. F. Fenne, 2013. "Rapid local acceleration of relativistic radiation-belt electrons by magnetospheric chorus," Nature, Nature, vol. 504(7480), pages 411-414, December.
    4. S. Kasahara & Y. Miyoshi & S. Yokota & T. Mitani & Y. Kasahara & S. Matsuda & A. Kumamoto & A. Matsuoka & Y. Kazama & H. U. Frey & V. Angelopoulos & S. Kurita & K. Keika & K. Seki & I. Shinohara, 2018. "Pulsating aurora from electron scattering by chorus waves," Nature, Nature, vol. 554(7692), pages 337-340, February.
    5. Richard B. Horne & Richard M. Thorne & Yuri Y. Shprits & Nigel P. Meredith & Sarah A. Glauert & Andy J. Smith & Shrikanth G. Kanekal & Daniel N. Baker & Mark J. Engebretson & Jennifer L. Posch & Maria, 2005. "Wave acceleration of electrons in the Van Allen radiation belts," Nature, Nature, vol. 437(7056), pages 227-230, September.
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