Magnetic slab

Alfvén mode on a single iso-surface

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In this section:

Alfvén Mode

Single iso-surface
Multiple iso-surface

Symmetric slab

Kink

Slow surface
Slow body 1
Slow body 2
Slow body 3
Fast surface
Fast body 1
Fast body 2
Fast body 3

Sausage

Slow surface
Slow body 1
Slow body 2
Slow body 3
Fast surface
Fast body 1
Fast body 2
Fast body 3

Asymmetric slab

Kink

Slow surface
Slow body 1
Slow body 2
Slow body 3
Fast surface
Fast body 1
Fast body 2
Fast body 3

Sausage

Slow surface
Slow body 1
Slow body 2
Slow body 3
Fast surface
Fast body 1
Fast body 2
Fast body 3

The Alfvén mode is decoupled from the magneto-acoustic modes in a magnetic slab.

The perturbations are in the homogeneous direction (y-direction), meaning that each magnetic iso-surface within the slab can oscillate independently without perturbing the plasma density or pressure.

Consequently, the parameters (and asymmetry) of the plasma external to the slab do not affect the propagation of this mode.

Videos

Key:

Red lines – magnetic field lines
Grey surface – slab boundaries
White arrows – velocity direction field

Download videos

Download the videos on this page (ZIP, 2.1MB).

Credits

The videos were produced by Matthew Allcock with Mayavi, an application and library for interactive scientific data visualisation and 3D plotting in Python.