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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Updated: Jan 23, 2026

Analysis of Shear Flow-induced Migration of Murine Marginal Zone B Cells In Vitro
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Large-scale dynamos driven by shear-flow-induced jets.

B Tripathi1,2, A E Fraser3, P W Terry4

  • 1University of Wisconsin-Madison, Madison, WI, USA. bt2693@columbia.edu.

Nature
|January 21, 2026
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Summary
This summary is machine-generated.

Scientists developed a new theory and simulations showing how unstable shear flows can generate large-scale magnetic fields through a jet-driven dynamo. This process is crucial for understanding astrophysical phenomena and laboratory plasmas.

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Area of Science:

  • Plasma physics
  • Astrophysics
  • Magnetohydrodynamics

Background:

  • Magnetic fields are fundamental to phenomena across scales, from star formation to laboratory plasmas.
  • The dynamo process, driven by turbulent flows, generates and sustains magnetic fields.
  • Existing mean-field dynamo theories, while useful, have limitations in parameter justification and first-principles understanding of turbulence.

Purpose of the Study:

  • To develop an ab initio theory for the generation of large-scale magnetic fields from unstable, driven shear flows.
  • To investigate the role of the mean-vorticity effect in magnetic field generation.
  • To explore the application of this dynamo mechanism in astrophysical and laboratory settings.

Main Methods:

  • Development of analytic theory for turbulent flows with unstable shear.
  • Advanced three-dimensional computer simulations of turbulence using high-resolution grids (up to 4,096 × 4,096 × 8,192).
  • Investigation of the role of large-scale, topologically protected jets in the dynamo process.

Main Results:

  • Demonstrated ab initio generation of quasi-periodic, large-scale magnetic fields from unstable shear flows.
  • Confirmed the importance of the mean-vorticity effect as a key dynamo process.
  • Identified the prior generation of large-scale three-dimensional jets as crucial for the dynamo mechanism.

Conclusions:

  • The jet-driven dynamo provides a first-principles explanation for large-scale magnetic field generation in driven turbulent systems.
  • This mechanism is applicable to both laboratory and astrophysical shear-driven systems.
  • The theory offers insights into the rapid generation of strong magnetic fields in events like binary neutron star mergers, relevant for multi-messenger astronomy.