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Related Experiment Videos

Electromagnetic instabilities in unmagnetized plasmas

Saleem1, Watanabe, Sato

  • 1PINSTECH (NPD), P.O. Nilore, Islamabad, Pakistan.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
Summary

Local plasma perturbations can generate electromagnetic fields. In nonuniform electron-ion plasmas, these instabilities can lead to megagauss magnetic fields, aligning with experimental findings.

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Area of Science:

  • Plasma Physics
  • Astrophysical Plasmas
  • Magnetohydrodynamics

Background:

  • Nonuniform, unmagnetized plasmas exhibit complex behaviors under local perturbations.
  • Understanding electromagnetic field generation is crucial for astrophysical phenomena and laboratory plasmas.

Purpose of the Study:

  • To investigate the generation of electromagnetic fields in nonuniform unmagnetized plasmas.
  • To analyze the role of plasma vorticity, compressibility, and density gradients in instability development.
  • To determine the conditions under which ion acoustic waves become electromagnetic.

Main Methods:

  • Theoretical analysis of plasma perturbations, focusing on electron and ion time scales.
  • Examination of coupling between plasma vorticity and compressibility in inhomogeneous plasmas.

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  • Inclusion of electron-ion plasma dynamics and thermal fluctuations in a collisionless model.

    • Main Results:

    • Linearly growing electromagnetic fields are generated on both electron and ion time scales.
    • Instabilities with mixed transverse and longitudinal characteristics arise in electron and electron-ion plasmas.
    • Ion acoustic waves can become electromagnetic in the presence of steep density gradients, leading to megagauss magnetic fields.

    Conclusions:

    • Plasma density inhomogeneity couples vorticity and compressibility, driving electromagnetic instabilities.
    • Ion dynamics are crucial for magnetic field instability in the low-frequency limit (omega << omega(pe)).
    • The electron-ion plasma model successfully predicts megagauss magnetic field magnitudes, consistent with observations.