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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://fosstodon.org/users/AkaSci/statuses/112415532484196432">AkaSci 🛰️ (akasci@fosstodon.org)'s status on Saturday, 11-May-2024 11:51:03 JST</a><a href="https://fosstodon.org/@AkaSci" title="akasci@fosstodon.org"><img src="https://gnusocial.jp/avatar/20805-48-20221219024513.webp" width="48" height="48" alt="AkaSci 🛰️" style="position: absolute; left: 0; top: 0;">AkaSci 🛰️</a><div><a href="https://fosstodon.org/@AkaSci/112415321628252557" rel="in-reply-to">in reply to</a><ul><li></ul></div></section><article><p>The largest magnetic storm of the last century occurred on 13 March 1989. Its effects included -<br>- A 9-hour outage of the Hydro-Québec power system.<br>- Significant interference to the U.S. power grid<br>- Several satellites lost control for several hours including GOES and NASA's TDRS-1.<br>- Orbit changes for 2500+ satellites<br>- Space Shuttle Discovery suffered a malfunction in a sensor on a hydrogen tank.</p><p><a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019SW002278" rel="nofollow noreferrer">https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019SW002278</a><br><a href="https://en.wikipedia.org/wiki/March_1989_geomagnetic_storm" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/March_1989_geomagnetic_storm</a><br><a href="https://mastodon.online/@mastodonmigration">@mastodonmigration</a> <br>7/n</p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/3073017#notice-6091567">In conversation</a><time datetime="2024-05-11T11:51:03+09:00" title="Saturday, 11-May-2024 11:51:03 JST">about 7 months ago</time> <span>from <span><a href="https://fosstodon.org/@AkaSci/112415532484196432" rel="external" title="Sent from fosstodon.org via ActivityPub">fosstodon.org</a></span></span><a href="https://fosstodon.org/@AkaSci/112415532484196432">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/2620313">Timeline for the magnetic disturbance of 13–14 March 1989. 
(top) The estimated interplanetary conditions. The black arrows show the storm sudden commencement times indicative of the arrival of the interplanetary coronal mass ejection shocks. 
(middle) The variation in geomagnetic activity.
(bottom) Magnetic latitude of the auroral zone equatorward boundary. Black diamonds show the times and latitudes of power system effects.</a></label><br><a href="https://cdn.fosstodon.org/media_attachments/files/112/415/703/070/144/782/original/acf70545b9cd02f7.png" rel="external">https://cdn.fosstodon.org/media_attachments/files/112/415/703/070/144/782/original/acf70545b9cd02f7.png</a></li><li><article><header><div>Domain not in remote thumbnail source whitelist: upload.wikimedia.org</div><h5><a href="https://en.wikipedia.org/wiki/March_1989_geomagnetic_storm">March 1989 geomagnetic storm</a></h5><div></div></header><div>The March 1989 geomagnetic storm occurred as part of severe to extreme solar storms during early to mid March 1989, the most notable being a geomagnetic storm that struck Earth on March 13. This geomagnetic storm caused a nine-hour outage of Hydro-Québec's electricity transmission system. The onset time was exceptionally rapid. Other historically significant solar storms occurred later in 1989, during a very active period of solar cycle 22.Geomagnetic storm and auroras
The geomagnetic storm causing this event is believed to be the result of two separate events known as coronal mass ejections (CME) on March 10 and 12, 1989. A few days before, on March 6, a very large X15-class solar flare also occurred.
Several days later, at 01:27 UT on March 13, a severe geomagnetic storm struck Earth. The storm began on Earth with extremely intense auroras at the poles. The aurora could be seen as far south as Texas and Florida. As this occurred during the Cold War, some people worried that a nuclear first strike might be in progress. Others incorrectly considered the intense auroras to be associated with the Space Shuttle...</div><footer></footer></article></li></ol></footer></blockquote>

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AkaSci 🛰️ (akasci@fosstodon.org)'s status on Saturday, 11-May-2024 11:51:03 JSTAkaSci 🛰️
in reply to
- Mastodon Migration
The largest magnetic storm of the last century occurred on 13 March 1989. Its effects included -
- A 9-hour outage of the Hydro-Québec power system.
- Significant interference to the U.S. power grid
- Several satellites lost control for several hours including GOES and NASA's TDRS-1.
- Orbit changes for 2500+ satellites
- Space Shuttle Discovery suffered a malfunction in a sensor on a hydrogen tank.
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019SW002278
https://en.wikipedia.org/wiki/March_1989_geomagnetic_storm
@mastodonmigration
7/n
In conversationabout 7 months ago from fosstodon.orgpermalink
Attachments
1. Timeline for the magnetic disturbance of 13–14 March 1989. (top) The estimated interplanetary conditions. The black arrows show the storm sudden commencement times indicative of the arrival of the interplanetary coronal mass ejection shocks. (middle) The variation in geomagnetic activity. (bottom) Magnetic latitude of the auroral zone equatorward boundary. Black diamonds show the times and latitudes of power system effects.
  https://cdn.fosstodon.org/media_attachments/files/112/415/703/070/144/782/original/acf70545b9cd02f7.png
2. Domain not in remote thumbnail source whitelist: upload.wikimedia.org
  March 1989 geomagnetic storm
  The March 1989 geomagnetic storm occurred as part of severe to extreme solar storms during early to mid March 1989, the most notable being a geomagnetic storm that struck Earth on March 13. This geomagnetic storm caused a nine-hour outage of Hydro-Québec's electricity transmission system. The onset time was exceptionally rapid. Other historically significant solar storms occurred later in 1989, during a very active period of solar cycle 22. Geomagnetic storm and auroras The geomagnetic storm causing this event is believed to be the result of two separate events known as coronal mass ejections (CME) on March 10 and 12, 1989. A few days before, on March 6, a very large X15-class solar flare also occurred. Several days later, at 01:27 UT on March 13, a severe geomagnetic storm struck Earth. The storm began on Earth with extremely intense auroras at the poles. The aurora could be seen as far south as Texas and Florida. As this occurred during the Cold War, some people worried that a nuclear first strike might be in progress. Others incorrectly considered the intense auroras to be associated with the Space Shuttle...

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