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Why experts say a solar storm could cause trillions of dollars worth of damage

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Andy Chee:
Anyone take any photos of aurora over the last few days?

floobydust:
Transformer protection uses CT's with their limited frequency response. GIC is in the millhertz. But apparently not an issue on the protection (not transformer) end:
"Practical GIC levels have a minor impact on transmission-rated CTs in steady states. Transiently, even small GIC levels can lead to CT saturation during faults, but the CT pulls out of this GIC-induced saturation very quickly (in a half-cycle). "While this effect is significant, it is similar to the impact of remanent flux, and it does not bring any new threats to properly designed protection systems."

I've worked with many SEL387 etc.
Tech paper: Schweitzer Engineering Laboratories Impact of geomagnetically induced currents on protection current transformers

I've also seen GIC in pipelines, causes nuisance tripping of cathodic protection systems.

David Hess:

--- Quote from: Andy Chee on May 12, 2024, 10:15:20 pm ---Anyone take any photos of aurora over the last few days?
--- End quote ---

I missed the strongest part by a couple hours here in New Hampshire, and had a lot of cloud cover anyway.  At its brightest, it covered the whole sky, but it was very dim almost requiring a long exposure photograph to see it.

Psi:
Was just looking up the X class ratings for the recent storm.

This one we just had was around X5.4
The Carrington Event in 1859 was around X45
Approx 14,300 years ago there was one thought to be around 10x the Carrington event, so that would be around X450

(Scale is linear, so X3 is 3x as powerful as X1).

I'm fascinated to know what living through an X450 would be like in modern day, but as pretty as it would look i'm sure it would be very very bad.

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