Rats in a cage decode

Scientists Reveal Crazy Plan to Terraform Mars With an Artificial Magnetic Field

https://www.sciencealert.com/scientists-reveal-crazy-plan-to-terraform-mars-with-an-artificial-magnetic-field

The interior of Mars is smaller and cooler, and we can't simply "start it up" to create a magnetic dynamo. But there are a few ways we can create an artificial magnetic field, as a recent study shows.

Ideas for generating a Martian magnetic field have been proposed before, and usually involve either ground-based or orbital solenoids that create some basic level of magnetic protection.

In the TV series The Expanse, you can see a couple of scenes where you catch a glimpse of them. While this latest study acknowledges that might work, it proposes an even better solution.

As the study points out, if you want a good planetary magnetic field, what you really need is a strong flow of charged particles, either within the planet or around the planet. Since the former isn't a great option for Mars, the team looks at the latter.