[Gaffer]

I used to be in communications in the Air Force. I was stationed at a location in the early 70s where an atmospheric SID (sudden ionospheric disturbance) occurred.

It shut off all HF communications. It took out everything we had up to UHF frequencies and even degraded Microwave comms. Supposed to happen on an 11 year sunspot cycle.

Higher frequencies are less affected, particularly when they don’t involve transmission via the ionosphere.

[RayChuang88]

When you have a lot of solar activity, all those extra particles hitting the Earth's upper atmosphere also results in a warming of the Earth's climate. That's why during the famous Maunder Minimum of 1645 to 1715, the result was some of the coldest winters in recorded history, with both the Thames River in England and the Seine River in France regularly freezing over every winter.

[fwdude]

What’s the backup plan when that happens?

[Hot Tabasco]

What exactly is affected since I’ve never seen any radio, cell phone or TV affected.......