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Posted by WorldPeas 1/19/2026

Level S4 solar radiation event(www.swpc.noaa.gov)
https://www.swpc.noaa.gov/products/goes-proton-flux
628 points | 198 commentspage 4
_carbyau_ 1/19/2026|
Weirdly, while the site in question is "blaring klaxons!" there are more "cool night lights!" posts than concern.
zamadatix 1/19/2026||
Unless you're in space, a large scale electrical operator, or relying on HF radio there isn't much reason to be interested other than the lights for a G4 (what this is currently classed as).
pvab3 1/20/2026||
my Telecaster sure was noisy this morning but I didn't think much of it
guerrilla 1/19/2026|||
> while the site in question is "blaring klaxons!"

No, it isn't. It clearly says everything is under control but it would be good to keep an eye on it.

rzzzt 1/20/2026||
Blaring Klaxons! https://youtu.be/LX2KX0OaofI
AnishLaddha 1/20/2026||
fascinating, hope our critical infrastructure can handle this. how long does something like this last, and will it have an effect on artemis 2?

hypothetical: if a carrington event-esque storm happens during the mission, how badly will the houston <-> orion module communication links be affected?

JoeDaDude 1/20/2026||
There is a video update from the NOAA Space Weather Prediction Center. (I could only find this on Facebook) https://www.facebook.com/reel/1190509063198524
aliljet 1/19/2026||
I wonder if we're going to see an aurora over Seattle tonight?
throwway120385 1/20/2026|
Too much light pollution. You'd have to get well outside of the city. I looked at the weather last night and I think there might have been some trails on Tiger where you would've seen it with headlamp off.

In Seattle you can barely see planets.

cbeach 1/19/2026||
Probably a stupid question, but should I unplug my EV? (UK)
_blk 1/20/2026||
Yes! Absolutely, but only if you want to drive it.
qayxc 1/20/2026|||
No need. Wrong type of solar event. You might be able to see auroras, though. I saw some a couple of hours ago.
jacquesm 1/20/2026||
No.
uticus 1/19/2026||
Possible aurora visible through central US tonight
tigerlily 1/19/2026||
Hopefully it's clear space weather for Artemis II coming up. I wonder what they do if it's inclement en route?
perihelions 1/20/2026|
There's not that much they can do. It's often discussed that if the extreme August 1972 solar storm had overlapped with an Apollo mission (it didn't), it would have acutely sickened the astronauts.

https://en.wikipedia.org/wiki/August_1972_solar_storms#Human...

> "Had a mission been taking place during August, those inside the Apollo command module would have been shielded from 90% of the incoming radiation. However, this reduced dose could still have caused acute radiation sickness if the astronauts were located outside the protective magnetic field of Earth, which was the case for much of a lunar mission. An astronaut engaged in EVA in orbit or on a moonwalk could have experienced severe radiation poisoning, or even absorbed a potentially lethal dose."

The Orion capsule's contingency plan looks something like this:

> "To protect themselves, astronauts will position themselves in the central part of the crew module largely reserved for storing items they’ll need during flight and create a shelter using the stowage bags on board. The method protects the crew by increasing mass directly surrounding them, and therefore making a denser environment that solar particles would have to travel through, while not adding mass to the crew module itself."

https://www.nasa.gov/missions/artemis/orion/scientists-and-e...

xattt 1/20/2026||
For All Mankind “illustrated” a solar storm at surface-level of the moon, including “boiling” regolith. I wonder how embellished this was, or whether particle bombardment would actually cause this.

My mind goes to the working mechanism of eidophor projectors, where oil on the projection bowl does indeed deform under electron beam exposure.

zahlman 1/19/2026||
It seems that the peak was several hours ago, and I haven't observed any effects from it...
guerrilla 1/19/2026|
The peak was originally supposed to be 6-7 hours from now... it's still showing KP 8 here though, so I'm not sure what's going on. It could get more intense.
_blk 1/20/2026||
Nice. And it's somewhat relieving to read this over a Starlink connection.
JumpCrisscross 1/20/2026|
Any aurora luck for those of us in the Rockies? (Near Yellowstone.)
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