alt.hn

1/19/2026 at 8:26:19 PM

Level S4 solar radiation event

 https://www.swpc.noaa.gov/news/g4-severe-geomagnetic-storm-levels-reached-19-jan-2026

by WorldPeas

1/19/2026 at 11:00:07 PM

If anyone is interested in what "G4" means in context, here's the scale: https://www.swpc.noaa.gov/noaa-scales-explanation

by jjcm

1/20/2026 at 4:07:24 AM

Interestingly, there are about 100 events of this severity (G4) per cycle, and a single cycle lasts 11 years. This means there are about nine G4 events on average per year.

by Helmut10001

1/20/2026 at 6:54:49 AM

Note, however, that the solar cycle [0] is so named due to its minimum and maximum: the most severe events will be clustered around the maximum, rather than spread out over the whole cycle (as your comment suggested) - so the "nine G4 events on average per year" is mathematically true but not so helpful.

[0]: https://en.wikipedia.org/wiki/Solar_cycle

by tomr_stargazer

1/20/2026 at 12:35:33 AM

G4: " Induced pipeline currents affect preventive measures, HF radio propagation sporadic..."

G5: " Pipeline currents can reach hundreds of amps, HF (high frequency) radio propagation may be impossible in many areas for one to two days..."

by 8bitsrule

1/20/2026 at 6:40:22 AM

Sam Altman has entered an agreement to acquire all future G4 and G5 energy

by mcs5280

1/20/2026 at 1:53:12 AM

"Cool! What's G13 do?" - Bill Hicks

Looks like G5 is the highest level and the scale system is used by NOAA.

by gexla

1/20/2026 at 7:58:58 PM

G13 could be a gamma-ray burst from a collapsing star less than 100 light years from earth

in which case, don't worry about it as we won't be around to worry about it further

astro-physics is AMAZING (until it kills you lol)

by ck2

1/20/2026 at 9:17:36 AM

>"Cool! What's G13 do?" - Bill Hicks

I hear that bit in my head every time a new plane or weapon designation is announced, glad to hear it stuck with others too.

by serf

1/20/2026 at 6:50:55 AM

Waiting until it's like a G6, Like a G6

Now I'm feelin' so fly like a G6

by justinator

1/20/2026 at 2:00:41 AM

"Free Energy!"

by gosub100

1/20/2026 at 5:17:46 AM

That's the nice thing about solar power, but it's still a limited time offer

by autoexec

1/20/2026 at 12:47:02 PM

Indirect Nuclear Fusion

by smcnally

1/20/2026 at 12:30:54 PM

I wonder if they’re still putting out music …

by tclancy

1/20/2026 at 8:27:10 AM

HF propagation is flaky at the best of times. It's affected by the day/night cycle and by the weather.

by dmurray

1/20/2026 at 8:15:12 AM

The scale seems capped at a pretty low upper end? It feels like with all the mindbogglingly huge numbers usually involved when talking about space, there must be much, much worse events possible. Is it just that we don't know enough about them due to lack of experience that these aren't included?

by 9dev

1/20/2026 at 12:12:01 AM

We are at kp 8.67. The Carrington event was a kp 9

by irthomasthomas

1/20/2026 at 12:42:56 AM

I am not an expert, but it’s worth noting that the kp index has a maximum value of 9. So though the Carrington event had a kp of 9, its intensity on the related (but not capped) HP30/HP60 scale [1] would likely have been higher. [1] https://kp.gfz.de/en/hp30-hp60

by ianruh

1/20/2026 at 1:01:23 AM

Queue Chernobyl documentary clip measuring the radiation as low because that’s as high the meter went

by repeekad

1/20/2026 at 2:17:29 AM

s/queue/cue/

Though I suppose you could also queue it.

by wyldfire

1/20/2026 at 7:04:37 AM

Meant the first and people should do the second, Chernobyl on HBO is great.

It’s also technically not a documentary but historical drama.

by repeekad

1/20/2026 at 1:17:14 AM

3.6 roentgen. Not great, not terrible!

by celsoazevedo

1/20/2026 at 4:55:26 AM

here, take one ö

by anonymous344

1/20/2026 at 6:47:59 AM

Everybody's a diacritic.

by wyldfire

1/20/2026 at 3:10:23 AM

*skin sloughs off*

by qingcharles

1/20/2026 at 5:37:47 AM

You didn't see any graphite because it's not there!

by anonym29

1/20/2026 at 6:15:10 PM

Everything about these miniseries was wonderful.

Casting (who played who), acting, costumes and scenography (where did they get all these '80 soviet cars), and choice of scenes to film.

I had my hair rising when the guy cleaning roof of a building neighboring the reactor got stuck in deadly radiation zone for 4x the allowed 13 seconds. "You're dead comrade."

by wafflemaker

1/20/2026 at 10:23:08 PM

kp 9 - not great, not terrible

by banku_brougham

1/20/2026 at 3:42:17 AM

This is also related to weaker solar events leading to stronger Earth storms due to Earth's weakening magnetic field.

by keepamovin

1/20/2026 at 1:28:08 AM

Have we been having these more recently?

I don't ever recall seeing these in the news so frequently. It feels like there are several a year now. A decade ago, never.

And I also never remember seeing Aurora at my latitudes.

Do we just have better sensing now, or is there some cycle on a period longer than a few years? Or maybe I'm crazy and just never noticed.

by echelon

1/20/2026 at 4:16:34 AM

Mid to late 2025 was the peak of an 11 year solar cycle (25th one since we've started keeping track). We're on the trailing end of that peak activity now, which is why the past year/several months has seemed so active compared to recent years past, and should decrease significantly (in frequency and intensity) as 2026 progresses.

There was also a fairly significant geomagnetic storm back in November of 2025 as well.

You can see the data here at NOAA's Space Weather site https://www.swpc.noaa.gov/products/solar-cycle-progression

by 0manrho

1/20/2026 at 1:44:13 PM

> Have we been having these more recently?

Yes, for suitable values of "recently".

> And I also never remember seeing Aurora at my latitudes.

How old are you?

If you're younger than say your mid-40s you probably won't remember the early 80s, which is the last time we had a solar maximum that really came to anything.

Solar activity rises and falls on an 11-year cycle, and right now we're experiencing quite a peak. The previous three, peaking in 2014, 2011, and 1989 were a bit of a bust.

There was a massive peak in 1979 and I can remember my dad showing me the aurora when I was about six or seven - it seemed to be present most nights over the winter. That was also around the time of the CB Radio craze, where atmospheric conditions were such that you could use "skip" - bouncing radio signals off the highly-charged ionosphere - to talk to people hundreds of miles away as if they were just down the road, even on the comparatively high frequencies that CB used. There was a bit of a peak in the late 80s, and some good RF propagation too, as well as some incredible aurora - although the big one I remember was in about the end of 1991, early 1992.

We had absolutely blistering hot summers followed by really cold and snowy winters, too, kind of like we're having at the moment.

If the solar cycles have a longer repeating cycle of intensity on the scale of a hundred years or so (and it looks a bit like they do) then the next solar maximum in about 2036 is going to be even bigger.

by ErroneousBosh

1/20/2026 at 1:33:05 AM

We've just passed the 11 year peak - the sun spot activity has a period of around 11 years.

by awesome_dude

1/19/2026 at 11:56:09 PM

Looks like we get these for about 60 days for periods lasting 11 years.

by xeckr

1/20/2026 at 1:23:13 AM

> Biological: Unavoidable radiation hazard to astronauts on EVA; passengers and crew in high-flying aircraft at high latitudes may be exposed to radiation risk.

Anyone have a sense of magnitude for this advisory? How much more radiation should an airline passenger expect to receive during a G4 event than normal?

by non-

1/20/2026 at 1:31:17 AM

roughly up to 5-10 times the normal dose.

by inatreecrown2

1/20/2026 at 4:41:58 AM

sounds "it's okey" ?

by NeoInHacker

1/20/2026 at 5:06:43 AM

Nowhere near lifetime occupational dose limits.

by jojobas

1/20/2026 at 7:24:33 AM

This was an S4 event, however.

by velocity3230

1/20/2026 at 7:30:38 AM

Belay that. The G-value was high too.

by velocity3230

1/20/2026 at 12:27:41 AM

so more of a 'bad storm here and there' level?

by neonmagenta

1/20/2026 at 1:47:40 PM

Just had my first uncorrectable memory read error on our servers in 10 years or so today (in Sacramento). I'd like to think it's related because the alternative (buying new DIMMs) is too horrifying to contemplate

by markonen

1/20/2026 at 5:02:00 PM

Last major storm I saw a significant number of single bit errors on my main server - never happened again, still using the same ram. So +1 anecdote

by buildbot

1/20/2026 at 8:00:58 PM

Is this detectable without some parity checks?

by dosnem

1/20/2026 at 9:44:21 PM

No, but ECC ram gives you _hardware_ parity checks, which is much faster and doesn’t require you to change your code.

by danielheath

1/19/2026 at 10:53:31 PM

We had intense aurora in Berlin, Germany. Green clouds dancing in the sky levels. Started around 22:10 local time or a bit earlier, and at this point there's only a faint red/green glow remaining.

by bartman

1/19/2026 at 11:35:16 PM

Yeah, there were auroras even as far south as Munich. Maybe not as intense, but it's the first aurora I ever saw, so I can't really judge...

by rob74

1/20/2026 at 12:26:51 AM

I am south-west of Munich and with a perfect clear sky I could only see stars, one meteor, and that's it.

by ccozan

1/20/2026 at 8:04:26 PM

It was visible in the 22:00-23:00 time window. Here in the south west, the sky started turning green around 22:30.

by fransje26

1/20/2026 at 4:26:39 PM

We also had them in Grenoble, south of France.

by Kyro38

1/20/2026 at 6:00:07 AM

Can confirm, I've seen pink/green glow over Berlin Sky (and pictures as well)

by madduci

1/20/2026 at 12:13:45 AM

Just spend an hour outsite (Northern Germany, 01:00 MET). Unfortunately nothing to report, neither visual nor on camera. Maybe I just went to late and missed the show. I hope you habe more luck in Canada and the US!

by fluxflexer

1/20/2026 at 6:00:38 AM

I'm Berlin was around 22-23 o'clock visible

by madduci

1/20/2026 at 12:16:05 AM

It's pretty subtle right now here in NL but I can still see it with the naked eye. Mostly greenish haze that fades in and out.

by jacquesm

1/20/2026 at 4:14:33 AM

ahh I just went outside (south of Utrecht) and saw nothing. Maybe too much light pollution.

by CalRobert

1/20/2026 at 10:40:45 AM

I'm lucky in that I was close to the IJsselmeer.

by jacquesm

1/20/2026 at 12:30:20 AM

I was just out at a dog park and saw nothing! We have clear skies. I can't believe I missed this.

by karim79

1/20/2026 at 6:02:58 PM

Next time take a long exposure picture with your phone. You might be able to see it that way.

by danesparza

1/19/2026 at 11:19:43 PM

Also seen in the Netherlands!

by paulmist

1/20/2026 at 3:21:55 AM

I tought I was seeing aurora borealis here at 4 am local time in the neighboring Grand Duchy of Luxemburg but it was just visual pollution due to lights from a city.

by TacticalCoder

1/19/2026 at 11:45:22 PM

Could you see it from the inner city or only closer to the edges?

by viscousviolin

1/20/2026 at 12:44:55 AM

Friends who live in Kreuzberg and Friedrichshain could see it pretty well. I'm a bit further south within Berlin where skies are minimally darker, but between 10pm and 11pm it was so bright that light pollution didn't matter.

Funnily enough, despite having lots of alerts set up it was my mom who texted me from northern Brandenburg as she spotted it after getting an alert from RegenRadar, of all apps...

by bartman

1/20/2026 at 2:18:49 AM

It's amazing to hear it's visible in such a big city. I don't have a good intuition for all the metrics that describe how strong this storm was/is, but when put like this it hits home.

Nice to hear earth weather apps also work great in space haha. I'll keep that in mind when I set up my own notifications. Hopefully I have time to look into it before the next storm hits.

by viscousviolin

1/20/2026 at 7:36:47 AM

Saw it in Fhain as well over Ostkreuz station

by thrawn0r

1/20/2026 at 6:17:34 AM

Oh really? Oh no I missed it! Is it going to happen again today?

by marc_g

1/19/2026 at 10:20:37 PM

Nice, you can already see some solar flares in Austria again.

https://www.foto-webcam.eu/webcam/kleinfleisskees/

https://www.foto-webcam.eu/

by miduil

1/19/2026 at 11:29:58 PM

Oh wow! https://www.foto-webcam.eu/webcam/ederplan/2026/01/20/0000

And up at the top right, left to "Latest" you can skip the time back and forth at 10 minute intervals. And then jump back like 10 images, what a beauty.

You can even see Starlink satellites https://www.foto-webcam.eu/webcam/ederplan/2026/01/19/1820

by qwertox

1/19/2026 at 11:51:53 PM

Those images around 19:00 are amazing. Thanks for sharing.

by caseyohara

1/19/2026 at 11:35:38 PM

I had the most intensely coloured lights visible in the west of Ireland. I've seen them a few times before but never like this. Phones were capturing them in video not just long exposures.

Not sure what the best service is to be alerted ahead of time. Apparently it'll be strong here again at 6am according to some of the apps some random people were waving around.

by frzen

1/19/2026 at 11:56:21 PM

There are several apps that do a good job of alerting users. I use "Aurora Pro", which I prefer because it checks cloud cover and lets you set alert thresholds based on viewing probability.

by ortusdux

1/20/2026 at 12:02:09 AM

I woke up to a notification from aurora pro today, I'd forgotten I had the app. This would explain it

by King-Aaron

1/20/2026 at 12:02:33 PM

Our network router in our radio station started acting crazy at 22:00:40 Europe/Ljubljana time. Uptime monitoring via HTTPS reported downtime for 5 minutes, but our radio archive that records audio over LiveWire recorded some bitcrushing effects for 5 minues. Maybe our Mikrotik hEX was flipping some bits? Recording from the radio archive: https://splet.4a.si./dir/solar.mp3

by jesprenj

1/20/2026 at 12:56:10 PM

Yes, sounds similar to a corrupted digital audio.

Replace hex with something more robust, at least with an actual metallic case.

by justsomehnguy

1/20/2026 at 4:43:27 PM

*Gemini Tech Tip #624:* Boost your Wi‑Fi and spiritual resilience by wrapping your router in aluminum foil! Protect against solar flares, reptilian packet theft, and basic physics. Turn it into a family craft: make and decorate foil router cozies and matching foil hats, then browse Reddit and/or the park, seeking fellow shiny‑headed believers.

by noumenon1111

1/20/2026 at 2:05:16 PM

Yes, that is planned. As soon as we get more money (:

by jesprenj

1/20/2026 at 1:35:27 PM

Sounds like a dialup modem at about 3:30 :)

How sure are we the aliens aren't trying to dial in?

by motrm

1/20/2026 at 1:33:05 AM

Any tips on best practices in how one can protect homelab rigs from a Carrington level event? Let's say we were given two days notice that the mother of all S4s was inbound. Just switch everything off?

What if one of my homelabs needed 100% uptime to meet my wife's SLA for messaging? Is this able to be protected?

by andrewinardeer

1/20/2026 at 2:40:53 AM

Not much? As I understand it, the major effects are in very long wires. Long wires can have get massive induced currents. But your homelab is unlikely to have long wires or very large loops. Ethernet wires are limited to 100m, and unshielded Ethernet is transformer-isolated to well over 1kV.

Shielded Ethernet could plausibly have issues with induced current on the shield. PoE might be less immune than ordinary Ethernet depending on what you’re doing with it, although well-behaved devices should be isolated. If you have a cable ISP, the cable shield might get toasty, although it’s likely to be grounded close enough to your house that any damage will be upstream.

Your 100% uptime will be tricky if your ISP goes down or you lose power.

by amluto

1/20/2026 at 2:28:43 AM

AFAIK the risk is for long transmission lines. So your equipment at home is not really in any danger, as long as there is not a major surge on the transmission lines that makes it all the way to your house. If that happens, well, losing the home lab is probably no longer the issue.

by rootusrootus

1/20/2026 at 3:10:01 AM

Make sure you have a surge protector or ups, in case it makes the power grid go funky. Which you should have anyway.

Also, it could be a convenient excuse to upgrade to fiber internet service if you haven't already. (Yes, excuse. Equipment should have more than good enough isolation to not care.)

by tbrownaw

1/20/2026 at 6:40:44 AM

Even if you don't have fiber all the way into your house, most cable internet terminates pretty close to the home these days. It kind of has to, since bandwidth has gone way up and as a result they can't put very many subscribers on the same termination system.

We didn't really understand this kind of thing when the Carrington event happened, so nobody knows for sure, but estimates for induced voltage on long conductors are usually something on the order of 20V/km. So for a 5 km long coaxial cable, you're only talking about ~120V of induced potential difference (i.e. the same voltage as a residential plug in the US). When people are analyzing the potential damage from this kind of electromagnetic disturbance (E3 is the term you'll see, based on analysis of nuclear EMP which has other components that you don't see in geomagnetic storms regardless of severity), it's mostly about really long conductors, like on the order of 100km.

by johncolanduoni

1/19/2026 at 11:02:21 PM

PJM had some geomagnetic disturbance warnings, but did not progress to the alert stage or grid re-configuation actions. So, no US power grid problems.

    104955 Warning Geomagnetic Disturbance Warning 01.19.2026 14:30 
    PJM-RTO
    A Geomagnetic Disturbance Warning has been issued for
    14:30 on 01.19.2026 through 16:00 on 01.19.2026 .
    A GMD warning of K8 or greater is in effect for this period. 
    End time: 01.19.2026 16:00
(All times are prevailing Eastern US time)

I've posted on this before, for other warnings. Not going to repeat that.

by Animats

1/20/2026 at 12:32:44 AM

Although everyone is interested in visible aurora, the proton flux is also really impressive. It peaked at 37,000 pfu at 1910Z. The highest ever recorded was 43,500 pfu in March 1991.

by drmpeg

1/19/2026 at 10:18:08 PM

This page looks like an accessibility nightmare. The entire warning text is an image. There is no transcription present for screen reader users. I did not expect this from a government website.

by dschuessler

1/19/2026 at 10:25:06 PM

Looking at the aspect ratio (and working in a bank) it's worse than that. That's a powerpoint slide.

by delusional

1/19/2026 at 11:19:32 PM

Not like someone with poor vision is going to be able to see the aurora borealis that results

/s

by delfinom

1/20/2026 at 7:29:36 AM

I missed it (seeing the Aurora) .. are there any reliable alerts for this sort of event, that do not alert me about anything else, but really only such big events?

by lukan

1/20/2026 at 7:47:52 AM

https://www.swpc.noaa.gov/content/subscription-services

by cvt7bm

1/20/2026 at 8:04:16 AM

Thanks, that seems exactly what I was looking for. (Now I have to figure out the best way to get a alert to my phone if my inbox receives such a mail, probably easiest to use a a mailadress just for this case and then treat this emailadress different)

by lukan

1/20/2026 at 10:18:00 AM

One caveat is, that these events cannot be forecasted in the same way as weather on earth can. You usually only have a lead time of 15 - 45 minutes. See also https://www.swpc.noaa.gov/content/aurora-tutorial

by MrGilbert

1/20/2026 at 10:48:36 AM

Sure. But if I am awake, those 15 minutes are enough to get dressed and go outside.

Yesterday I just would have had to walk to the balkony to see it, but I was busy with some frustrating coding problem instead ..

by lukan

1/20/2026 at 12:59:52 PM

same, I was awake for the whole night but completely missed it

by Levitating

1/20/2026 at 12:10:30 PM

On iOS there’s an app literally called “Aurora”.

It will notify you when you’re in an area with a high Kp (or above a Kp you specify).

by vachina

1/20/2026 at 4:25:00 PM

I had registered for alerts on https://aurorasaurus.org/. But that alert was sent way too late for me (strongest lights were yesterday around 10-11 PM, and the notification was sent 2 AM today). But I was very lucky and just noticed the lights by accident on my way home.

by albertzeyer

1/19/2026 at 11:17:54 PM

I'll be going out tonight if this continues into Australian night time hours.

At this strength, I could see the full display including colors with my naked eye in Melbourne, May 11th 2024. This storm is slightly stronger than that event.

by aussieguy1234

1/20/2026 at 7:54:55 AM

I'll be attempting to get some photos/footage from Esperance.

by ikr678

1/20/2026 at 8:12:36 AM

There's a high triple threat bar for Astro photos sourced from Western Australia.

https://apod.nasa.gov/apod/ap110529.html

If you manage to pull off the Aurora Australis above a triple curl at The Right with a shark body surfing into the green room ... the internet will explode.

by defrost

1/19/2026 at 11:17:06 PM

Australian Bureau of Meteorology advisory for visible aurora: https://www.sws.bom.gov.au/Aurora

by bashtoni

1/20/2026 at 12:58:35 AM

Worth noting that Kp, which many talk about in discussions online, is more or less useless for anyone in Australia or the southern hemisphere. Lots of beginner Aurora chasers here get tripped up by that.

What is useful is KAus and the G index, KAus is shown on this page, so thats what i'll be tracking.

by aussieguy1234

1/19/2026 at 11:30:21 PM

Are there any resources to track Aurora sightings or predicted sightings?

by jp0d

1/20/2026 at 2:32:18 AM

https://aurora-alerts.uk/ Ignore the UK TLD, this tracks global sightings

by lakid

1/20/2026 at 10:31:16 PM

Ahh thank you! I saw a few photos from last night's Aurora sightings down here in Vic, Australia. Maybe next time! :)

by jp0d

1/19/2026 at 11:42:28 PM

At the bottom right of that page is a subscribe link, with a number of different alerts and lists to subscribe to.

by stubish

1/20/2026 at 10:32:08 PM

Thank you!

by jp0d

1/19/2026 at 11:26:57 PM

Is that tonight or last night?

by hahahahhaah

1/20/2026 at 12:20:47 AM

It was only issued this morning Australian time, so I presume it's for tonight.

by bashtoni

1/19/2026 at 11:15:53 PM

Years ago I was concerned about this and made a plan with my wife for what to do if she was at work.

But now we have a bunch of kids in different schools and haven't updated our plan.

Does anyone have a plan for what happens if we have a really bad event?

by PlatoIsADisease

1/19/2026 at 11:20:10 PM

A really bad event would be that long-distance transmission lines act like antennas and pick up millions of volts and blow up all the transformers.

I don't know how much you can plan for that other than "if it happens, try to get home", and then all the usual prepper stuff.

by hnuser123456

1/20/2026 at 12:18:04 AM

Pray for clear skies and go out and watch the beautiful aurora, silly!

Depending on the kids' ages, you can teach them quite a lot about the Earth's magnetic field and why the aurora concentrates at the poles, how the high-energy particles light up the sky (it's a lot like a neon light), and how the atmosphere shields us from any danger despite the spectacular show.

by myself248

1/19/2026 at 11:35:12 PM

For a really bad event that managed to blow a lot of transformers (presumably due to grid operators not seeing it coming) ... well, take up farming.

by rootusrootus

1/20/2026 at 8:32:52 AM

Disconnect your telegraph batteries and run on aurora power only

by internet_points

1/19/2026 at 11:17:52 PM

Keep a couple days water and food on hand, go up to the pub, have a pint, and wait for this all to blow over.

by fuzzer371

1/19/2026 at 11:27:51 PM

With how much modern cars rely on electronics, I would not try to drive during such an event.

by JoshTriplett

1/20/2026 at 12:08:50 AM

It’s ok - The Winchester is within walking distance.

by whyleyc

1/20/2026 at 12:58:57 AM

Omg i watched this yesterday!

by jrgd

1/19/2026 at 11:30:50 PM

Solar flares are only dangerous to very long conductors.

by lxgr

1/20/2026 at 12:06:18 AM

so cancel the limo?

by luxuryballs

1/20/2026 at 12:50:37 AM

That's a safety feature. It prevents you from drinking and driving if you go to a pub during a solar flare. :)

by throwaway81523

1/20/2026 at 12:57:56 AM

No one would drive to the pub anyway. Better walking back home…

by jrgd

1/20/2026 at 1:24:18 AM

Valid. I think I have such an ingrained different set of assumptions (a pub being just another kind of place for food, and "going to" anything involving a form of transportation) that that didn't even occur to me.

by JoshTriplett

1/20/2026 at 8:51:58 AM

Feel a bit sensationalistic. It happens, it's not rare, and we've always got on with life perfectly fine.

by esskay

1/19/2026 at 11:20:00 PM

Buy a bit of extra food and water.

by Tepix

1/19/2026 at 11:53:22 PM

And toilet paper! Rolls and rolls of toilet paper!

by y1n0

1/19/2026 at 11:22:11 PM

First rule of fight club...

by swader999

1/20/2026 at 1:09:42 AM

Discussion of the event https://community.spaceweatherlive.com/topic/4210-x19-cme/

by Kunsang

1/20/2026 at 2:25:37 AM

This is definitely not a language I speak!

Flux and bZ!

by neogodless

1/20/2026 at 11:37:47 AM

Surely you must be familiar with the flux capacitor? ;)

by imp0cat

1/20/2026 at 10:10:08 PM

I understand maybe half of this, but I followed the discussion and knew when it was about time to go outside.

by Kunsang

1/20/2026 at 8:41:23 AM

Damn, I love finding some hyper-specific forums like this one.

Sooo much jargon.

by fnands

1/19/2026 at 11:56:53 PM

How rare is this?

G4 storms are ~100 per solar cycle (~11 years).

So roughly 9 G4 events/year on average.

by WhitneyLand

1/20/2026 at 3:00:46 AM

But they should mostly be in the same part of the cycle rather than spread evenly.

It probably wouldn't make sense to calculate "average snow days per month" across an entire calendar year (in most places...), this is the same thing.

by tbrownaw

1/20/2026 at 11:31:58 AM

This is an S4. Last S4 event was in October 2003.

by rapht

1/20/2026 at 7:26:57 AM

This is an S4, though.

by velocity3230

1/20/2026 at 7:31:29 AM

Belay that. The G-value was high too.

by velocity3230

1/20/2026 at 12:58:15 AM

Like 20-25 years rare according to some space weather youtuber.

by burnt-resistor

1/20/2026 at 4:35:12 AM

> some space weather youtuber

Please stop watching that guy, he is a total fraud and knows nothing about physics.

by creatonez

1/20/2026 at 11:16:20 AM

As seen from my apartment in Reykjavík Iceland: https://ss.solberg.is/89N0qS7T

by jokull

1/20/2026 at 1:03:51 PM

That’s beautiful. But you get aurora even sans G4, true? Was this more intense and spectacular?

by smcnally

1/20/2026 at 9:56:47 PM

Yes - not seen it this red though.

by jokull

1/20/2026 at 4:07:37 PM

Had to stay up until 2am shutting down our spacecraft. Stupid sun hates to see me get a solid night’s sleep.

by notfish

1/20/2026 at 5:54:28 PM

What spacecraft is your spacecraft?

by aclindsa

1/20/2026 at 6:35:33 PM

And where did you park it? And what's the combination to open the hatch?

by phendrenad2

1/20/2026 at 1:49:04 PM

Well I didn't see anything last night (In Eastern Canada), probably because there was too much light in the suburb. Now the aurora "area" turns back to Europe and Asia, I hope you guys enjoy it!

Judging by this picture: https://services.swpc.noaa.gov/images/animations/ovation/nor... , I think in a few hours the whole North Europe can see it very clearly.

by markus_zhang

1/20/2026 at 3:21:51 PM

Your URL is broken (for me)

by T0Bi

1/20/2026 at 2:21:25 PM

Might be a coincidence but for the first time last night, my son's sleep projector[0] didn't stop after 1h like it does normally.

I guess this could be related to it? (we are in Montreal)

I doubt these toys are protected from those kinds of events.

[0] https://www.amazon.com/Fisher-Price-Settle-Sleep-Projection-...

by juliend2

1/19/2026 at 10:55:49 PM

Do you need long exposure to make it visible with a camera? How does that work in the presence of light pollution?

by ComputerGuru

1/19/2026 at 11:08:54 PM

Tonight I could see the colours without the camera but it definitely stands out more with the long exposure of the camera.

Even with lights in the direct line of the shot you you can get good results - presumably the phone is doing HDR to achieve this.

by thebruce87m

1/21/2026 at 12:13:59 AM

I tried it last night (generally cloudless sky). With the naked eye it just looked like light pollution. With long exposure it looked like a weirdly lit picture. In neither case did I see any hint of green or red.

I’m not in the city, but you’d have to actually be two states away to escape its light (literally not figuratively, according to dark sky maps).

:(

by ComputerGuru

1/19/2026 at 11:55:35 PM

Local light pollution normally makes it hard to see with anything short of long exposure, but today it was naked eye visible and regular photos also captured it.

by Macha

1/20/2026 at 8:51:16 PM

Scott Manley just did a video on radiation shielding: https://www.youtube.com/watch?v=DJcbevbBzsc

Based on that, I presume the astronauts on the ISS will need to take cover due to this event

by trashface

1/20/2026 at 1:09:53 AM

Title says "S4" solar radiation event, but the linked page says "G4" geomagnetic storm

by nbf_1995

1/20/2026 at 7:56:28 AM

I live somewhat close to the arctic circle and the aurora has been exceptional lately. One recent evening it looked like there was a massive city behind the cloud cover, and a few nights before when the sky was clear I watched enormous green flames for hours.

by cess11

1/20/2026 at 3:00:08 PM

Verizon will probably retroactively blame their outage on it.

by mrbluecoat

1/20/2026 at 12:57:00 AM

Up to G-5 possibly. Cell phone visible in dark areas throughout most of CONUS.

It was mentioned that air travel ionizing radiation exposure increases during geomagnetic storms. I'd consider pausing travel for a couple of days to not be a guinea pig because there's not enough data to consider it safe. If anyone absolutely must fly tonight, it'd be interesting if they were to take a high sensitivity dosimeter to see what happens.

by burnt-resistor

1/20/2026 at 8:43:46 AM

Not sure how to deal with this kind of wildly unbalanced risk assessment

by garbagewoman

1/20/2026 at 7:31:29 PM

What are the best apps to get notified when there's a geomagnetic storm /chances to see Aurora? Preferably not only for USA.

by wafflemaker

1/19/2026 at 11:17:00 PM

Weirdly, while the site in question is "blaring klaxons!" there are more "cool night lights!" posts than concern.

by _carbyau_

1/19/2026 at 11:30:03 PM

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).

by zamadatix

1/20/2026 at 2:39:26 AM

my Telecaster sure was noisy this morning but I didn't think much of it

by pvab3

1/19/2026 at 11:23:31 PM

> 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.

by guerrilla

1/20/2026 at 4:00:53 AM

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?

by AnishLaddha

1/19/2026 at 11:52:26 PM

I wonder if we're going to see an aurora over Seattle tonight?

by aliljet

1/20/2026 at 6:55:32 PM

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.

by throwway120385

1/19/2026 at 11:41:42 PM

Probably a stupid question, but should I unplug my EV? (UK)

by cbeach

1/20/2026 at 3:42:31 AM

Yes! Absolutely, but only if you want to drive it.

by _blk

1/20/2026 at 12:03:00 AM

No need. Wrong type of solar event. You might be able to see auroras, though. I saw some a couple of hours ago.

by qayxc

1/20/2026 at 12:06:29 AM

No.

by jacquesm

1/19/2026 at 9:15:29 PM

Possible aurora visible through central US tonight

by uticus

1/19/2026 at 11:32:27 PM

Hopefully it's clear space weather for Artemis II coming up. I wonder what they do if it's inclement en route?

by tigerlily

1/20/2026 at 12:24:05 AM

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...

by perihelions

1/20/2026 at 6:53:23 AM

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.

by xattt

1/19/2026 at 10:36:11 PM

It seems that the peak was several hours ago, and I haven't observed any effects from it...

by zahlman

1/19/2026 at 11:24:52 PM

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.

by guerrilla

1/20/2026 at 3:41:11 AM

Nice. And it's somewhat relieving to read this over a Starlink connection.

by _blk

1/20/2026 at 10:22:19 PM

Any aurora luck for those of us in the Rockies? (Near Yellowstone.)

by JumpCrisscross

1/19/2026 at 11:21:08 PM

Darn Montreal is still too south. Wish I were in Winnipeg.

by ferguess_k

1/20/2026 at 10:01:51 AM

What strength would destroy the sensor?

by brador

1/20/2026 at 1:22:54 AM

any effects on the human body??

by anon115

1/20/2026 at 8:38:15 AM

Depends. If you're outside at night and tilt your head up, the Default Mode Network of your brain may be temporarily suppressed, while dopamine may increase.

by internet_points

1/19/2026 at 11:54:31 PM

We never get aurora in Japan :(

by tramtrist

1/20/2026 at 3:46:51 AM

Hokkaido got some back in November: https://www.asahi.com/ajw/articles/16155623

by pilaf

1/20/2026 at 11:48:52 AM

Yeah I figure Hokkaido may get a taste but we here in Honshu never do :'(

by tramtrist

1/20/2026 at 10:19:30 PM

[dead]

by MORPHOICES

1/20/2026 at 4:02:25 AM

TL;DR: A severe (G4-level) geomagnetic storm hit Earth on January 19, 2026 due to a solar coronal mass ejection. It can disrupt power grids, GPS, satellite systems, and radio communications, while creating visible aurora displays at higher latitudes.

by sparin9

1/20/2026 at 11:51:28 AM

[dead]

by hindustanuday

1/19/2026 at 10:34:54 PM

[flagged]

by yzydserd