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Charged particle dynamics in turbulent current sheets.

A V Artemyev1, D L Vainchtein1, A I Neishtadt1

  • 1Space Research Institute RAS, Moscow 117997, Russia.

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Magnetic field fluctuations disrupt charged particle motion in current sheets, leading to particle trapping. This study quantifies the rate of adiabatic invariant diffusion and its impact on particle dynamics.

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Area of Science:

  • Plasma Physics
  • Astrophysics
  • Space Physics

Background:

  • Charged particles in current sheets are crucial for understanding space plasma phenomena.
  • Adiabatic theory typically describes charged particle motion in magnetic fields.
  • Magnetic field fluctuations can alter particle dynamics, but their precise impact is complex.

Purpose of the Study:

  • To investigate the dynamics of charged particles in current sheets with magnetic fluctuations.
  • To determine how magnetic field fluctuations affect the adiabatic invariant of charged particles.
  • To quantify the rate of diffusion of the adiabatic invariant and its consequences.

Main Methods:

  • Utilizing adiabatic theory to model unperturbed charged particle motion.
  • Analyzing the destruction of the adiabatic invariant due to magnetic field fluctuations.
  • Deriving analytical estimates for the rate of adiabatic invariant diffusion.
  • Comparing analytical findings with numerical simulations.

Main Results:

  • Magnetic field fluctuations destroy the adiabatic invariant of charged particles.
  • The evolution of the adiabatic invariant's distribution follows a diffusion equation.
  • The rate of adiabatic invariant diffusion is proportional to the power density of magnetic field fluctuations.
  • Adiabatic invariant diffusion leads to transient particle trapping in current sheets, with over 50% trapping at significant fluctuation amplitudes.

Conclusions:

  • Destruction of adiabaticity significantly impacts charged particle behavior in current sheets.
  • Particle trapping due to adiabatic invariant diffusion can alter the state and properties of current sheets.
  • These findings have implications for understanding energy transfer and particle acceleration in astrophysical plasmas.