Level S4 solar radiation event

(swpc.noaa.gov)

122 points | by WorldPeas 3 hours ago

22 comments

  • jjcm 58 minutes ago
    If anyone is interested in what "G4" means in context, here's the scale: https://www.swpc.noaa.gov/noaa-scales-explanation
    • xeckr 2 minutes ago
      Looks like we get these for about 60 days for periods lasting 11 years.
  • frzen 23 minutes ago
    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.

    • ortusdux 2 minutes ago
      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.
  • bartman 1 hour ago
    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.
    • rob74 23 minutes ago
      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...
    • Tachyooon 13 minutes ago
      Could you see it from the inner city or only closer to the edges?
    • paulmist 39 minutes ago
      Also seen in the Netherlands!
  • miduil 1 hour ago
    Nice, you can already see some solar flares in Austria again.

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

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

  • WhitneyLand 1 minute ago
    How rare is this?

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

    So roughly 9 G4 events/year on average.

  • bashtoni 41 minutes ago
    Australian Bureau of Meteorology advisory for visible aurora: https://www.sws.bom.gov.au/Aurora
    • jp0d 28 minutes ago
      Are there any resources to track Aurora sightings or predicted sightings?
      • stubish 16 minutes ago
        At the bottom right of that page is a subscribe link, with a number of different alerts and lists to subscribe to.
    • hahahahhaah 31 minutes ago
      Is that tonight or last night?
  • rediguanayum 39 minutes ago
    Moon should be good too to see Aurora tonight: waxing crescent 1% https://www.moongiant.com/phase/today/
  • Animats 56 minutes ago
    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.

  • dschuessler 1 hour ago
    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.
  • aliljet 6 minutes ago
    I wonder if we're going to see an aurora over Seattle tonight?
  • tramtrist 4 minutes ago
    We never get aurora in Japan :(
  • PlatoIsADisease 42 minutes ago
    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?

    • hnuser123456 38 minutes ago
      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.

    • rootusrootus 23 minutes ago
      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.
    • Tepix 38 minutes ago
      Buy a bit of extra food and water.
      • y1n0 5 minutes ago
        And toilet paper! Rolls and rolls of toilet paper!
    • swader999 36 minutes ago
      First rule of fight club...
    • fuzzer371 40 minutes ago
      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.
      • JoshTriplett 30 minutes ago
        With how much modern cars rely on electronics, I would not try to drive during such an event.
        • lxgr 28 minutes ago
          Solar flares are only dangerous to very long conductors.
  • ComputerGuru 1 hour ago
    Do you need long exposure to make it visible with a camera? How does that work in the presence of light pollution?
    • Macha 3 minutes ago
      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.
    • thebruce87m 49 minutes ago
      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.

  • tigerlily 26 minutes ago
    Hopefully it's clear space weather for Artemis II coming up. I wonder what they do if it's inclement en route?
  • _carbyau_ 41 minutes ago
    Weirdly, while the site in question is "blaring klaxons!" there are more "cool night lights!" posts than concern.
    • zamadatix 28 minutes ago
      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).
    • guerrilla 35 minutes ago
      > 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.

  • aussieguy1234 40 minutes ago
    I'll be going out tonight if this continues into Australian night time hours.

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

  • ferguess_k 37 minutes ago
    Darn Montreal is still too south. Wish I were in Winnipeg.
  • zahlman 1 hour ago
    It seems that the peak was several hours ago, and I haven't observed any effects from it...
    • guerrilla 33 minutes ago
      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.
  • cbeach 17 minutes ago
    Probably a stupid question, but should I unplug my EV? (UK)
  • uticus 2 hours ago
    Possible aurora visible through central US tonight
  • yzydserd 1 hour ago
    Another flare up over Greenland.