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Journal Articles Geophysical Research Letters Year : 2019

MMS Measurements and Modeling of Peculiar Electromagnetic Ion Cyclotron Waves

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1
Justin H. Lee
  • Function : Author
Drew L. Turner
  • Function : Author
Sarah K. Vines
  • Function : Author
Robert C. Allen
  • Function : Author
Stephen A. Fuselier
  • Function : Author
Yuri V. Khotyaintsev
  • Function : Author
Ian J. Cohen
  • Function : Author
Barry H. Mauk
  • Function : Author
Christopher T. Russell
  • Function : Author
Craig J. Pollock
  • Function : Author
Robert E. Ergun
  • Function : Author
Per-Arne L. Lindqvist
  • Function : Author
James L. Burch
  • Function : Author

Abstract

Orbiting Earth's dayside outer magnetosphere on 29 September 2015, the Magnetospheric Multiscale (MMS) satellites measured plasma composition, simultaneous electromagnetic ion cyclotron waves, and intermittent fast plasma flows consistent with ultralow frequency waves or convection. Such flows can accelerate typically unobservable low-energy plasma into a measurable energy range of spacecraft plasma instrumentation. We exploit the flow occurrence to ensure measurement of cold ion species alongside the hot particles—consisting of ionospheric heavy ions and solar wind He++—during a subinterval of wave emissions with spectral properties previously described as peculiar. Through application of the composition and multisatellite wave vector data to linear theory, we demonstrate the emissions are in fact consistent with theory, growing naturally in the He++ band with sufficient free energy.
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insu-03674391 , version 1 (20-05-2022)

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Justin H. Lee, Drew L. Turner, Sergio Toledo-Redondo, Sarah K. Vines, Robert C. Allen, et al.. MMS Measurements and Modeling of Peculiar Electromagnetic Ion Cyclotron Waves. Geophysical Research Letters, 2019, 46, pp.11,622-11,631. ⟨10.1029/2019GL085182⟩. ⟨insu-03674391⟩
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