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Torus instability.

B Kliem¹, T Török

¹Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany.

Physical Review Letters

|August 16, 2006

Summary

The expansion instability of toroidal current rings in magnetized plasma was studied. This research unifies spheromak expansion and solar coronal mass ejections, explaining both fast and slow types.

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Area of Science:

Plasma Physics
Astrophysics
Magnetohydrodynamics

Background:

Toroidal current rings in magnetized plasma exhibit expansion instabilities.
Understanding these instabilities is crucial for both laboratory plasma experiments and astrophysical phenomena.
Solar coronal mass ejections (CMEs) present distinct fast and slow classes.

Purpose of the Study:

To investigate the expansion instability of toroidal current rings in low-beta magnetized plasma.
To establish a unified theoretical framework for phenomena involving toroidal plasma structures.
To connect laboratory plasma behavior with solar atmospheric dynamics.

Main Methods:

Theoretical investigation of plasma dynamics.
Analysis of toroidal current ring expansion.
Comparison with experimental data from spheromak devices.
Correlation with observational data of solar coronal mass ejections.

Main Results:

The study identified key mechanisms driving the expansion instability in toroidal current rings.
Qualitative agreement was found between theoretical predictions and spheromak expansion experiments.
The findings provide a unifying explanation for the essential properties of both fast and slow solar CMEs.
The research bridges the gap between laboratory plasma physics and solar astrophysics.

Conclusions:

The expansion instability of toroidal current rings offers a unified perspective on spheromak dynamics and solar CMEs.
This work reconciles the apparently disparate fast and slow CME classes.
The findings have implications for understanding plasma confinement and explosive astrophysical events.

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