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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Updated: May 25, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Large-scale magnetic field generation by randomly forced shearing waves.

T Heinemann¹, J C McWilliams, A A Schekochihin

¹Institute for Advanced Study, Princeton, New Jersey 08540, USA.

Physical Review Letters

|January 17, 2012

Summary

This summary is machine-generated.

This study presents a theory for generating large-scale magnetic fields using fluid motion and shear. It analytically explains the shear dynamo effect, previously observed numerically.

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Published on: March 3, 2017

Area of Science:

Magnetohydrodynamics
Plasma Physics
Astrophysical Dynamos

Background:

Large-scale magnetic fields are crucial in astrophysics and geophysics.
The generation of magnetic fields by fluid motion (the dynamo effect) is a fundamental problem.
Recent numerical experiments suggested a new mechanism: the shear dynamo.

Purpose of the Study:

To develop a rigorous theoretical framework for the shear dynamo.
To analytically explain the generation of magnetic fields by random, nonhelically forced fluid motions combined with linear shear.
To provide a theoretical basis for recently observed numerical results.

Main Methods:

Analytical theory in the low magnetic Reynolds number (Rm) and weak shear limit.
Kinematic dynamo approach focusing on fluctuations in the electromotive force.
Minimal proof-of-concept quasilinear calculation.

Main Results:

Derived analytical scalings for the wave number and growth rate of the fastest-growing mode.
Provided a theoretical explanation for previously unexplained numerical observations.
Demonstrated that shear dynamo action can arise from fluctuations in the net electromotive force.

Conclusions:

The shear dynamo effect is theoretically validated.
The analytical model successfully reproduces key features observed in numerical simulations.
The simplicity of the model suggests shear dynamo action may be common in sheared magnetohydrodynamic turbulence.