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A comment on Continued G4 (Severe) Geomagnetic Storming Observed. Parent comment

Re:Continued G4 (Severe) Geomagnetic Storming Observed by lgats on Friday September 08, 2017 @02:37PM (#15202849)
Having subscribed to NOAA's alerts a couple years ago, I would say we might get an event like this once a year or two
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Re:Continued G4 (Severe) Geomagnetic Storming Observed by jsjohnst on Friday September 08, 2017 @03:14PM (#15203157)
Per the link above, this is the 8th most powerful CME hitting earth in recorded history. An X9.3 is not a yearly thing.
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Re:Continued G4 (Severe) Geomagnetic Storming Observed by Rebelgecko on Friday September 08, 2017 @04:11PM (#15203539)
How far back does "recorded history" go for these sorts of detailed space weather measurements? The linked #8 ranking seems to be based on 20 years of data
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Re:Continued G4 (Severe) Geomagnetic Storming Observed by PoachedSausage on Saturday September 09, 2017 @08:40AM (#15206802)
As far back as the Carrington Event at least.

https://en.wikipedia.org/wiki/Solar_storm_of_1859

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Re:Continued G4 (Severe) Geomagnetic Storming Observed by SolarNet on Friday September 08, 2017 @05:10PM (#15203991)
I think they go back to the early telegraph based off of observations of static on the wire and other related problems (a telegraph was basically a giant inductor).
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Re:Continued G4 (Severe) Geomagnetic Storming Observed by Rebelgecko on Friday September 08, 2017 @06:05PM (#15204290)
Are those classifications listed somewhere? I suspect that they'd be much less accurate than the measurements from modern equipment (e.g. satellites)
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