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On the Collisionless Asymmetric Magnetic Reconnection Rate.

Yi-Hsin Liu1, M Hesse2,3, P A Cassak4

  • 1Department of Physics and Astronomy, Dartmouth College, Hanover, NH, USA.

Geophysical Research Letters
|September 25, 2018
PubMed
Summary

This study predicts the steady state reconnection electric field in asymmetric magnetic reconnection by maximizing the reconnection rate. The model, with no free parameters, aligns with previous findings and suggests a universal reconnection rate of 0.1.

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Astrophysics

Background:

  • Understanding magnetic reconnection is crucial for space and astrophysical plasma evolution.
  • Previous models for asymmetric reconnection had a free parameter for the diffusion region's aspect ratio.

Purpose of the Study:

  • To predict the steady state reconnection electric field in asymmetric magnetic reconnection.
  • To investigate the origin of the nearly universal reconnection rate of 0.1.

Main Methods:

  • Maximizing the reconnection rate as a function of the upstream magnetic field's opening angle.
  • Comparing predictions with existing asymmetric reconnection models in the collisionless limit.

Main Results:

  • The prediction for the reconnection electric field is within a factor of 2 of the Cassak & Shay (2007) model.
  • The new model has no free parameters, unlike previous ones.
  • The normalized reconnection rate of 0.1 arises from maximizing the rate within magnetohydrodynamic constraints.

Conclusions:

  • The nearly universal reconnection rate of 0.1 in asymmetric geometry is the maximal rate allowed at the magnetohydrodynamic scale.
  • This finding has implications for transport processes at plasma boundaries, such as Earth's magnetopause.