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Simultaneous macroscale and microscale wave-ion interaction in near-earth space plasmas.

Z-Y Liu1, Q-G Zong2,3, R Rankin4

  • 1Institute of Space Physics and Applied Technology, Peking University, Beijing, China.

Nature Communications
|September 23, 2022
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Summary

Scientists observed energy transfer from large to small scales in space plasmas. This process, involving ultra-low-frequency and electromagnetic-ion-cyclotron waves, energizes ions efficiently in astrophysical and space environments.

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Area of Science:

  • Astrophysics and space physics
  • Plasma physics
  • Space weather

Background:

  • Understanding energy transfer across scales in collisionless plasmas is crucial for studying plasma evolution and high-energy particle generation.
  • Energy dissipation mechanisms in astrophysical and space plasmas remain an active area of research.

Purpose of the Study:

  • To identify and characterize cross-scale energy transfer events in collisionless plasmas.
  • To investigate the role of simultaneous macroscale and microscale wave-ion interactions in plasma energization.

Main Methods:

  • Utilized NASA's Magnetospheric Multiscale (MMS) spacecraft for in-situ observations within Earth's magnetosphere.
  • Analyzed data from two distinct events exhibiting simultaneous interactions between hot ions and waves at different scales.

Main Results:

  • Observed direct energy transfer from macroscale (~100 km) ultra-low-frequency waves to microscale (~10 km) electromagnetic-ion-cyclotron (EMIC) waves.
  • Demonstrated EMIC-wave-induced ion energization as the dissipation mechanism at microscales.
  • Direct measurements confirmed the efficiency of this cross-scale energy transfer process, occurring over approximately one minute (ten EMIC-wave periods).

Conclusions:

  • Simultaneous macroscale and microscale wave-ion interactions provide an efficient mechanism for cross-scale energy transfer.
  • This process is key to plasma energization in astrophysical and space environments.
  • Experimental evidence supports the proposed cross-scale energy transfer pathway.