[matthewh (OP)]

Hudd wanted to know:

Can we compress magnetic fields?


Let us know what you can unravel!

[chiralSPO]

Isn't that essentially what happens when two like poles (ie north and north, or south and south) are brought into close proximity?

[evan_au]

When stars with a magnetic field are compressed into a neutron star, the magnetic field is compressed too.
It is thought that this produces "magnetars" with extremely strong magnetic fields.
See: https://en.wikipedia.org/wiki/Magnetar

One of the ways used to produce very strong magnetic transients locally is to compress a magnetic field with explosives.
See: https://en.wikipedia.org/wiki/Explosively_pumped_flux_compression_generator