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Ion cooling in collisionless plasma expansion.

P Mora1

  • 1Centre de Physique Théorique, École Polytechnique, Centre National de la Recherche Scientifique, 91128 Palaiseau, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 14, 2015
PubMed
Summary
This summary is machine-generated.

Ion cooling during collisionless plasma expansion is slower than expected. This occurs due to significant ion distribution function changes, leading to substantial ion heat flow and increased electron heat flux.

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Area of Science:

  • Plasma Physics
  • Astrophysics
  • Space Science

Background:

  • Collisionless plasma expansion is crucial for understanding astrophysical phenomena.
  • Adiabatic models often oversimplify ion cooling dynamics.
  • Previous models like the water-bag model have limitations.

Purpose of the Study:

  • To re-examine ion cooling mechanisms in collisionless plasma expansion.
  • To identify the reasons for discrepancies between theoretical predictions and observed ion cooling rates.
  • To analyze the impact on electron heat flux.

Main Methods:

  • Analysis of ion cooling in collisionless plasma expansion.
  • Investigation of initial Maxwellian ion distributions.
  • Comparison with adiabatic laws and water-bag models.

Main Results:

  • Ion cooling is significantly slower than predicted by adiabatic laws for Maxwellian ion distributions.
  • A strong distortion of the ion distribution function drives a large ion heat flow.
  • Electron heat flux increases compared to scenarios with zero ion temperature.

Conclusions:

  • Adiabatic approximations are insufficient for accurately describing ion cooling in this context.
  • Ion heat flow, driven by distribution function distortion, is a key factor.
  • Electron heat flux is sensitive to ion temperature dynamics.