But Diamagnetic Cavities?

Since this region has weak fields, trapped plasma will distort the field.
As the plasma drifts around the minimum |B|, it produces a “cusp ring current” that opposes the cusp field and makes a diamagnetic cavity.
How are these diamagnetic cavities related to the quadrupole trapped plasma?
- These cavities are filled with mirror mode waves and high turbulence.

Since this region has weak fields, trapped plasma will distort the field.