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From Foreshock 30-Second Waves to Magnetospheric Pc3 Waves.

Lucile Turc1, Kazue Takahashi2, Primož Kajdič3

  • 1Department of Physics, University of Helsinki, Helsinki, Finland.

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|March 10, 2025
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Summary
This summary is machine-generated.

Ultra-low frequency waves, originating in the ion foreshock, propagate through Earth's magnetosphere and are observed on the ground. This review covers research on these foreshock 30-second/Pc3 waves from their origin to their detection.

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Geophysics

Background:

  • Ultra-low frequency waves are crucial for near-Earth plasma dynamics and energy transfer.
  • Pc3 waves (10-45s period) are observed in the dayside magnetosphere, originating from the ion foreshock.
  • These waves arise from interactions between shock-reflected ions and the solar wind upstream of Earth's bow shock.

Purpose of the Study:

  • To provide a comprehensive review of research on foreshock 30-second/Pc3 waves.
  • To cover the entire propagation pathway of these waves, from the foreshock to ground observations.
  • To synthesize observational, theoretical, and numerical studies on these waves.

Main Methods:

  • Review of historical and current research.
  • Analysis of observational data from space and ground.
  • Examination of theoretical models and numerical simulations.

Main Results:

  • Foreshock waves, predominantly fast-magnetosonic with ~30s periods, are linked to Pc3 waves observed in the magnetosphere and on the ground.
  • Evidence suggests wave transmission across geospace, through the bow shock and magnetopause.
  • A historical overview of research from the 1960s to present is presented.

Conclusions:

  • The review synthesizes current understanding of foreshock/Pc3 wave propagation.
  • Identifies unresolved questions and future research opportunities in observations and simulations.
  • Highlights the importance of these waves in magnetospheric dynamics and energy transfer.