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Magnetostatic Boundary Conditions

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Related Experiment Video

Updated: May 25, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Mirror mode expansion in planetary magnetosheaths: Bohm-like diffusion.

Akira Hasegawa¹, Bruce T Tsurutani

¹Osaka University, Yamadaoka 2-1, Suita, Japan.

Physical Review Letters

|January 17, 2012

Summary

Observed mirror modes in planetary magnetosheaths are larger than predicted. A Bohm diffusion process explains this by shifting wave numbers as modes move away from their source, matching observations across multiple celestial bodies.

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Area of Science:

Space Physics
Plasma Physics
Planetary Science

Background:

Mirror modes are observed in planetary magnetosheaths with scale sizes larger than theoretically predicted.
The instability's maximum growth rate typically corresponds to smaller scale sizes than observed.

Purpose of the Study:

To explain the observed scale sizes of mirror modes in planetary magnetosheaths.
To introduce a diffusion process that accounts for the discrepancy between theoretical predictions and observations.

Main Methods:

Introduced a Bohm diffusion process to model the shift in wave number spectra.
Applied the developed theory to spacecraft data from Earth, Jupiter, Saturn, and the heliosheath.

Main Results:

The Bohm diffusion model successfully explains why observed mirror mode scales are larger than those associated with maximum instability growth.
The theory demonstrated reasonable agreement with existing spacecraft observations from various planetary magnetosheaths and the heliosheath.

Conclusions:

Observed mirror mode scale sizes in planetary magnetosheaths can be explained by incorporating a Bohm diffusion process.
The findings suggest that wave number spectra shift as modes convect away from their source.
Further observational tests are recommended to validate the proposed theory.