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Electron Heating in High Mach Number Collisionless Shocks.

A Vanthieghem1,2,3, V Tsiolis2, A Spitkovsky2

  • 1<a href="https://ror.org/02en5vm52">Sorbonne Université</a>, <a href="https://ror.org/029nkcm90">Observatoire de Paris</a>, Université PSL, CNRS, LERMA, F-75005 Paris, France.

Physical Review Letters
|July 12, 2024
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Summary
This summary is machine-generated.

We developed a new model for electron heating in high Mach number shock waves, explaining energy transfer between electrons and ions. This mechanism is crucial for understanding high-energy astrophysical phenomena.

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Area of Science:

  • Plasma physics
  • Astrophysics
  • High-energy phenomena

Background:

  • Energy partition in high Mach number collisionless shock waves is critical for high-energy astrophysical environments.
  • Understanding electron heating mechanisms is essential for modeling these phenomena.

Purpose of the Study:

  • To present a novel theoretical model for electron heating at shocks.
  • To explain the energy exchange between electrons and ions.
  • To investigate the role of differential inertia and microturbulence.

Main Methods:

  • Developed a new theoretical model for electron heating.
  • Analyzed the energy exchange between electrons and ions based on inertia differences.
  • Investigated the self-consistent interplay of ambipolar electric fields and electron transport.
  • Compared model predictions with fully kinetic simulations.

Main Results:

  • The model explains efficient electron heating through differential scattering off microturbulence.
  • The interplay between ambipolar fields and diffusive electron transport is key.
  • Heating occurs in magnetic fields generated by the Weibel instability.
  • Results are consistent with fully kinetic simulations.

Conclusions:

  • The proposed model provides a fundamental mechanism for electron heating in high Mach number shocks.
  • This mechanism is vital for understanding energy dissipation in astrophysical plasmas.
  • The findings align with advanced numerical simulations, validating the theoretical approach.