[Starwatcher2001]

If this subject interests you, I'd highly recommend the book "Sunfall" by Jim Al-Khalili. It's the physicist's first venture into fiction and is based around the threat of coronal mass ejections and a flipping of the Earths magnetic field. He also weaves hacking, encryption and other science themes into the plot.

As you might expect from a theoretical physicist, it's based on solid science, with a small amount of poetic licence that he describes in the afterword.

It's been described as "The Day After Tomorrow meets Neuromancer". Not sure I'd quite go that far, but it's a damn good read.