[HN Gopher] G2 (Moderate) Geomagnetic Storm Watch Issued for 11 ...
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G2 (Moderate) Geomagnetic Storm Watch Issued for 11 October 2021
Author : ag8
Score : 37 points
Date : 2021-10-10 17:57 UTC (5 hours ago)
(HTM) web link (www.swpc.noaa.gov)
(TXT) w3m dump (www.swpc.noaa.gov)
| Animats wrote:
| Hasn't come up in the PJM status dashboard, so the northeastern
| power grid isn't concerned about it. If they were, there would be
| a geomagnetic disturbance warning listed:
|
| Last listed event was back in May: 103172
| Warning Geomagnetic Disturbance Warning
| 05.12.2021 08:50 PJM-RTO A Geomagnetic Disturbance
| Warning has been issued for 08:50 on 05.12.2021
| through 20:00 on 05.12.2021 . A GMD warning of K-7 or
| greater is in effect for this period.
|
| There was no "Alert", the next stage, so no action was required.
|
| That May 12th event produced a minor press release.[1]
|
| PJM has more material about this. See pages 25-67 of their
| training guide for contingencies.[2] This goes into a lot of
| detail, from how solar wind influences transmission lines to
| where the sensors for this are to detailed graphs of transformer
| heating. Useful info for people who work in power stations.
| ("Noise: 20 dB jump. - It is pretty loud. Myth: Vibrations can
| destroy a transformer. Vibration a function of GIC; not a big
| concern.")
|
| Trouble is related to geography. Ground conductivity, related to
| iron deposits, matters. There are maps in that training guide.
| Only some lines are affected. Most problems can be avoided by
| changing power routing, which is what the PJM control center in
| Valley Forge PA does all day.
|
| They consider events from G1 to G4 to have minor impact. And,
| yes, they know all about the Carrington Event and the 1989 event.
| Which, incidentally, damaged only one transformer but did cause
| some blackouts.
|
| Before getting wound up about this, go read all that material.
|
| [1] https://insidelines.pjm.com/pjm-issues-geomagnetic-
| disturban...
|
| [2] https://www.pjm.com/-/media/training/nerc-
| certifications/gen...
| bonyt wrote:
| Is this uncommon? Apparently G2 storms happens 600 times per
| cycle, where a cycle is 11 years?
|
| https://weatherboy.com/wp-content/uploads/2021/02/Geomagneti...
|
| https://weatherboy.com/g2-geomagnetic-storm-watch-issued-for...
| TrainedMonkey wrote:
| I believe vast majority of them don't hit Earth.
| shoghicp wrote:
| A storm is categorized by intensity when it hits Earth.
|
| It is common, but not an everyday occurrence
| fhars wrote:
| When exactly is "around midday" in a NOAA.gov announcement that
| has a timestamp in UTC and mentions New York to Washington state
| as affected areas?
| badrabbit wrote:
| Will this have any meaningful interference on electronics?
| digitallyfree wrote:
| I wonder if modern power grids and communication systems have
| been built to be more resillient against large solar storms.
| There was one in 1989 that knocked out the Quebec power grid
| (https://en.wikipedia.org/wiki/March_1989_geomagnetic_storm).
| panarky wrote:
| Possible power grid fluctuations, especially at higher
| latitudes.
|
| Possible issues with spacecraft.
|
| High-frequency radio at high latitudes could fade.
|
| Aurora could be visible as far south as New York, Wisconsin and
| Washington state in the US.
|
| (FTFA)
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(page generated 2021-10-10 23:00 UTC)