# Solar Wave Theory Group

## Magnetic slab

### Alfvén mode on multiple iso-surfaces

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, Blue to Red volume - negative to positive density perturbation.