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Re:NOAA declares a G5 (extreme) geomagnetic storm by gnabgib on Friday May 10, 2024 @08:05PM (#40324922)
Ongoing discussion [0] (200 points, 6 hours ago, 199 comments), related Most of Europe is glowing pink under the aurora [1] (335 points, 2 hours ago, 95 comments)

[0]: https://news.ycombinator.com/item?id=40321821 [1]: https://news.ycombinator.com/item?id=40324179

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Re:NOAA declares a G5 (extreme) geomagnetic storm by yreg on Friday May 10, 2024 @09:35PM (#40325363)
The last G5 storm was in 2003

https://en.wikipedia.org/wiki/2003_Halloween_solar_storms

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Re:NOAA declares a G5 (extreme) geomagnetic storm by pyuser583 on Friday May 10, 2024 @11:16PM (#40325735)
According to NOAA, this is the first G5. https://www.swpc.noaa.gov/news/g5-conditions-observed
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Re:NOAA declares a G5 (extreme) geomagnetic storm by Ao7bei3s on Saturday May 11, 2024 @12:35AM (#40325976)
It's written in an ambiguous way and you interpreted it incorrectly. "G5 Conditions were first observed at Earth at 6:54 p.m. EDT today." should be read like "today, G5 conditions where first observed at 6:54", not "G5 conditions where first observed today (at 6:54)".

G5 is defined as K_p = 9. That happened in Oct 2003. https://ftp.gwdg.de/pub/geophys/kp-ap/kp-freq/kp2003.frq

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Re:NOAA declares a G5 (extreme) geomagnetic storm by pyuser583 on Saturday May 11, 2024 @01:08AM (#40326091)
Thank you!
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Re:NOAA declares a G5 (extreme) geomagnetic storm by hi-v-rocknroll on Saturday May 11, 2024 @12:47AM (#40326022)
It's back down to a G4 for now.

https://www.spaceweather.gov

* Solar wind currently has a mean delay of about 2.5 days. Light takes 504 seconds to reach us at this time of year.

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