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Hall magnetic reconnection rate.

J D Huba1, L I Rudakov

  • 1Plasma Physics Division, Naval Research Laboratory, Washington, DC, USA.

Physical Review Letters
|November 5, 2004
PubMed
Summary
This summary is machine-generated.

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Magnetic reconnection rates in the Hall limit are nearly independent of initial current sheet thickness. This finding holds true across various scales, indicating robust Hall reconnection dynamics.

Area of Science:

  • Plasma Physics
  • Magnetohydrodynamics
  • Astrophysics

Background:

  • Magnetic reconnection is a fundamental process in plasma physics, crucial for energy release in astrophysical and laboratory plasmas.
  • The Hall effect becomes significant in thin current sheets, modifying reconnection dynamics away from classical MHD predictions.

Purpose of the Study:

  • To investigate the influence of initial current sheet thickness on the magnetic reconnection rate in the Hall regime.
  • To determine the asymptotic reconnection rate and its dependence on system parameters.

Main Methods:

  • Two-dimensional Hall magnetohydrodynamic (MHD) simulations were performed.
  • Simulations were run to a steady state using four different initial current sheet thicknesses.
  • The reconnection rate was analyzed as a function of the ion inertial length (c/omega(pi)).

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Main Results:

  • The asymptotic magnetic reconnection rate in the Hall limit is found to be nearly independent of the initial current sheet width.
  • The Hall reconnection rate shows weak dependence on initial current layer width, approximately 0.1*V(A0)*B0.
  • The rate is independent of the scale at which the electron "frozen-in" condition breaks down (if < c/omega(pi)) and system size.

Conclusions:

  • The magnetic reconnection rate in the Hall limit is robust and not strongly sensitive to the initial configuration of the current sheet.
  • These findings have implications for understanding energy dissipation in space plasmas, such as solar flares and magnetospheric substorms.