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  1. Home
  3. Determining Emic Wave Vector Properties Through Multi-point Measurements: The Wave Curl Analysis.
  1. Home
  3. Determining Emic Wave Vector Properties Through Multi-point Measurements: The Wave Curl Analysis.

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Determining EMIC Wave Vector Properties Through Multi-Point Measurements: The Wave Curl Analysis.

S K Vines1, B J Anderson1, R C Allen1

  • 1The Johns Hopkins University Applied Physics Laboratory Laurel MD USA.

Journal of Geophysical Research. Space Physics
|April 19, 2021

View abstract on PubMed

Summary
This summary is machine-generated.

Scientists developed a new method using the Magnetospheric MultiScale (MMS) spacecraft to determine the wave vector (k) of electromagnetic ion cyclotron (EMIC) waves. This technique accurately measures EMIC wave properties, crucial for understanding particle loss in Earth's magnetosphere.

Keywords:
EMICelectromagnetic ion cyclotron wavesobservational techniquewave vector

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Magnetospheric Physics

Background:

  • Electromagnetic ion cyclotron (EMIC) waves are significant drivers of particle loss in Earth's magnetosphere.
  • Accurate knowledge of the wave vector (k) is essential for understanding EMIC wave propagation and wave-particle interactions.
  • Previous methods for determining k have limitations, necessitating new observational techniques.

Purpose of the Study:

  • To present and validate a novel observational technique for determining the wave vector (k) of EMIC waves.
  • To leverage the unique multi-spacecraft capabilities of the Magnetospheric MultiScale (MMS) mission for wave analysis.
  • To enable systematic studies of EMIC wave properties and their impact on magnetospheric dynamics.

Main Methods:

  • Developed a wave curl analysis technique using the curl of the wave magnetic field to determine k.
  • Applied the method to synthetic EMIC wave data with varying properties.
  • Validated the technique using an observed EMIC wave event from MMS and compared results with WHAMP dispersion solutions and other multi-spacecraft methods.

    • Main Results:

    • The wave curl analysis successfully determined the wave vector (k) for both synthetic and observed EMIC waves.
    • Derived k values showed good agreement with WHAMP dispersion solutions and other observational techniques.
    • The method demonstrated robustness when applied to wave intervals containing 3-4 wave periods across a wide frequency range.

    Conclusions:

    • The multi-spacecraft wave curl analysis provides a reliable method for directly determining EMIC wave vector properties.
    • This technique enhances our ability to study EMIC wave propagation and wave-particle interactions in the magnetosphere.
    • The MMS mission's instrumentation is well-suited for implementing this advanced wave analysis technique.