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Related Experiment Video

Updated: Jan 15, 2026

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

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Published on: February 3, 2014

Models of Collisionless Quasineutral Solar Wind Current Sheets.

Sophie Boswell¹, Thomas Neukirch¹, Anton Artemyev²

¹School of Mathematics and Statistics, University of St. Andrews, St. Andrews, UK.

|October 16, 2025

Summary

This summary is machine-generated.

Solar wind current sheets exhibit asymmetric density and temperature variations. A new model with modified electron distribution functions reveals substructure within these plasma sheets.

Keywords:

Electric currents and current sheets Magnetic fields, models Plasma theory Solar wind, theory

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The Diffusion of Passive Tracers in Laminar Shear Flow

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Area of Science:

Space Physics
Plasma Physics
Astrophysics

Background:

In situ solar wind measurements reveal kinetic scale current sheets.
These sheets are often force-free with plasma beta of order one.
Observed particle density and temperature asymmetries across current sheets were previously modeled.

Purpose of the Study:

To modify existing force-free collisionless current sheet models.
To investigate the effect of an additional term in the electron distribution function only.
To analyze the resulting plasma density and electric field substructure.

Main Methods:

Modification of self-consistent force-free collisionless current sheet models.
Inclusion of an additional term in the electron distribution function, keeping ions Maxwellian.
Numerical solution of the nonlinear quasineutrality condition alongside Ampère's law.

Main Results:

The magnetic field remains approximately force-free.
A non-zero quasineutral electric field arises.
An additional spatial substructure of plasma density is observed within the current sheet.

Conclusions:

The modified model provides insights into current sheet dynamics.
Theoretical findings may relate to observed current sheet substructures.
Asymmetric electron distributions can create density substructures in solar wind current sheets.