| ▲ | jjcm 7 hours ago |
| If anyone is interested in what "G4" means in context, here's the scale: https://www.swpc.noaa.gov/noaa-scales-explanation |
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| ▲ | Helmut10001 2 hours ago | parent | next [-] |
| 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. |
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| ▲ | 8bitsrule 5 hours ago | parent | prev | next [-] |
| 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..." |
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| ▲ | gexla 4 hours ago | parent | next [-] | | "Cool! What's G13 do?" - Bill Hicks Looks like G5 is the highest level and the scale system is used by NOAA. | |
| ▲ | gosub100 4 hours ago | parent | prev [-] | | "Free Energy!" | | |
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| ▲ | irthomasthomas 6 hours ago | parent | prev | next [-] |
| We are at kp 8.67. The Carrington event was a kp 9 |
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| ▲ | ianruh 5 hours ago | parent | next [-] | | 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 | | |
| ▲ | repeekad 5 hours ago | parent [-] | | Queue Chernobyl documentary clip measuring the radiation as low because that’s as high the meter went | | |
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| ▲ | kelseydh an hour ago | parent | prev | next [-] | | Disturbance storm time index (DST) is a better measure of peak intensity as KP is just a weighted average of the intensity from the last three hours across monitoring stations. The May 2024 G5 electrical storm had a peak measured DST of −412 nT: https://en.wikipedia.org/wiki/May_2024_solar_storms The Carrington Event had an estimated peak DST of −800 nT to −1750 nT, but no one really knows: https://en.wikipedia.org/wiki/Carrington_Event | |
| ▲ | keepamovin 2 hours ago | parent | prev | next [-] | | This is also related to weaker solar events leading to stronger Earth storms due to Earth's weakening magnetic field. | |
| ▲ | echelon 5 hours ago | parent | prev [-] | | 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. | | |
| ▲ | 0manrho 2 hours ago | parent | next [-] | | 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 | |
| ▲ | awesome_dude 4 hours ago | parent | prev [-] | | We've just passed the 11 year peak - the sun spot activity has a period of around 11 years. |
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| ▲ | non- 5 hours ago | parent | prev | next [-] |
| > 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? |
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| ▲ | xeckr 6 hours ago | parent | prev | next [-] |
| Looks like we get these for about 60 days for periods lasting 11 years. |
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| ▲ | neonmagenta 6 hours ago | parent | prev [-] |
| so more of a 'bad storm here and there' level? |
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