Magnetic nulls in interacting dipolar fields

@article{Elder2020MagneticNI,
  title={Magnetic nulls in interacting dipolar fields},
  author={Todd Elder and Allen H. Boozer},
  journal={Journal of Plasma Physics},
  year={2020},
  volume={87}
}
The prominence of nulls in reconnection theory is due to the expected singular current density and the indeterminacy of field lines at a magnetic null. Electron inertia changes the implications of both features. Magnetic field lines are distinguishable only when their distance of closest approach exceeds a distance $\varDelta _d$. Electron inertia ensures $\varDelta _d\gtrsim c/\omega _{pe}$. The lines that lie within a magnetic flux tube of radius $\varDelta _d$ at the place where the field… 
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