<p><b>1921年5月磁暴</b>是威力巨大的一次日冕大量拋射對地球磁層造成影響的重大事件。它發生在5月13日至15日，是第15太陽週期的一部分。此一事件發生在廣泛的應用互聯互通的電氣系統和一般電器依賴跨基礎結構發達之前，即使造成地面電流的強度超過造成北美洲東部大停電的1989年3月磁暴，所受的影響也僅限於某些部門。在當時，科學家測量引起風暴的黑子在5月10日的大小是94,000乘21,000 平方英里（131,000乘33,800平方公里）。
</p><p>在美國東部有許多地區都能看見極光，創造出明亮的夜空。電報服務在美國是因為保險絲被燒斷而被拖慢，到14日午夜才因設備損壞而幾乎完全中斷。另一面，由於電離層的活躍使得越洋的無線電傳輸信號增強。電燈似乎沒有受到明顯的影響。海底電纜也遭受磁暴的影響，歐洲也有電訊系統受到損壞的報導，南半球也受到影響。
</p>
<h2><span id=".E7.9B.B8.E9.97.9C.E6.A2.9D.E7.9B.AE"></span><span id="相關條目">相關條目</span></h2>
<ul><li>太陽風暴列表</li></ul><h2><span id=".E5.8F.83.E8.80.83.E8.B3.87.E6.96.99"></span><span id="參考資料">參考資料</span></h2>
<h3><span id=".E8.A8.BB.E8.A7.A3"></span><span id="註解">註解</span></h3>

<h3><span id=".E6.9B.B8.E7.9B.AE"></span><span id="書目">書目</span></h3>
<ul><li>JSTOR 40710695</li>
<li><cite class="citation web">Solar Storm and Aurora of May 13, 1921. Solarstorms.org.  <span> [<span>December 18,</span> 2012]</span>. （原始內容存檔於2006-09-28）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.btitle=Solar+Storm+and+Aurora+of+May+13%2C+1921&amp;rft.genre=unknown&amp;rft.pub=Solarstorms.org&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FSS1921.html&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook"><span> </span></span></li>
<li><cite class="citation news">Northern Lights Are Busy <span>(PDF)</span>. New York Times. May 14, 1921: 10 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-03）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Northern+Lights+Are+Busy&amp;rft.date=1921-05-14&amp;rft.genre=article&amp;rft.jtitle=New+York+Times&amp;rft.pages=10&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921h.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Aurora Borealis Halts Telegraph Service to City <span>(PDF)</span>. The Atlanta Constitution. May 15, 1921: 1 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-03）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Aurora+Borealis+Halts+Telegraph+Service+to+City&amp;rft.date=1921-05-15&amp;rft.genre=article&amp;rft.jtitle=The+Atlanta+Constitution&amp;rft.pages=1&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921j.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Henry K. Bunn. The Story The Week Has Told <span>(PDF)</span>. The Atlanta Constitution. May 15, 1921: 8 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-04）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=The+Story+The+Week+Has+Told&amp;rft.au=Henry+K.+Bunn&amp;rft.date=1921-05-15&amp;rft.genre=article&amp;rft.jtitle=The+Atlanta+Constitution&amp;rft.pages=8&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921k.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Tricky Aurora Snarls Up Wires <span>(PDF)</span>. Chicago Daily Tribune. May 15, 1921: 1 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-03）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Tricky+Aurora+Snarls+Up+Wires&amp;rft.date=1921-05-15&amp;rft.genre=article&amp;rft.jtitle=Chicago+Daily+Tribune&amp;rft.pages=1&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921n.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Aurora is Disturber <span>(PDF)</span>. The Los Angeles Times. May 15, 1921: 1 &amp; 2 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-03）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Aurora+is+Disturber&amp;rft.date=1921-05-15&amp;rft.genre=article&amp;rft.jtitle=The+Los+Angeles+Times&amp;rft.pages=1+%26+2&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921p.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">The Aurora Borealis <span>(PDF)</span>. The Los Angeles Times. May 16, 1921: 14 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-03）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=The+Aurora+Borealis&amp;rft.date=1921-05-16&amp;rft.genre=article&amp;rft.jtitle=The+Los+Angeles+Times&amp;rft.pages=14&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921s.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Aurora Borealis Effect on Wires Laid to Sun Spot <span>(PDF)</span>. The Atlanta Constitution. May 16, 1921: 3 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-03）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Aurora+Borealis+Effect+on+Wires+Laid+to+Sun+Spot&amp;rft.date=1921-05-16&amp;rft.genre=article&amp;rft.jtitle=The+Atlanta+Constitution&amp;rft.pages=3&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921m.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Sunspot Credited with Rail Tie-Up <span>(PDF)</span>. New York Times. May 16, 1921: 2 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-04）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Sunspot+Credited+with+Rail+Tie-Up&amp;rft.date=1921-05-16&amp;rft.genre=article&amp;rft.jtitle=New+York+Times&amp;rft.pages=2&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921a.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Magnetic Tremors Expected to Pass Within 48 Hours <span>(PDF)</span>. New York Times. May 16, 1921: 1 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-04）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Magnetic+Tremors+Expected+to+Pass+Within+48+Hours&amp;rft.date=1921-05-16&amp;rft.genre=article&amp;rft.jtitle=New+York+Times&amp;rft.pages=1&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921b.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Cables Still Show Effects of Aurora <span>(PDF)</span>. New York Times. May 18, 1921: 12 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-03）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Cables+Still+Show+Effects+of+Aurora&amp;rft.date=1921-05-18&amp;rft.genre=article&amp;rft.jtitle=New+York+Times&amp;rft.pages=12&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921e.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Electric Disturbances Affect French Wires: Aurora Not Visible, Its Absence Being Attributed to Atmospheric Conditions <span>(PDF)</span>. New York Times. May 18, 1921: 12 <span> [<span>December 19,</span> 2012]</span>. （原始內容 <span>(PDF)</span>存檔於2016-03-04）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Electric+Disturbances+Affect+French+Wires%3A+Aurora+Not+Visible%2C+Its+Absence+Being+Attributed+to+Atmospheric+Conditions&amp;rft.date=1921-05-18&amp;rft.genre=article&amp;rft.jtitle=New+York+Times&amp;rft.pages=12&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921f.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation news">Magnetic Storms Don't Affect Radio <span>(PDF)</span>. New York Times. May 26, 1921: 23 <span> [<span>December 19,</span> 2012]</span>.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Magnetic+Storms+Don%27t+Affect+Radio&amp;rft.date=1921-05-26&amp;rft.genre=article&amp;rft.jtitle=New+York+Times&amp;rft.pages=23&amp;rft_id=http%3A%2F%2Fwww.solarstorms.org%2FNewsPapers%2F1921g.pdf&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li>
<li><cite class="citation journal">S.M. Silverman; E.W.Cliver. Low-latitude auroras: the magnetic storm of 14–15 May 1921. Journal of Atmospheric and Solar-Terrestrial Physics. March 2001, <b>63</b> (5): 523–525 <span> [<span>December 18,</span> 2012]</span>. <span title="Bibcode">Bibcode:2001JASTP..63..523S</span>. <span title="數位物件識別號">doi:10.1016/S1364-6826(00)00174-7</span>. （原始內容存檔於2019-11-08）.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A1921%E5%B9%B45%E6%9C%88%E7%A3%81%E6%9A%B4&amp;rft.atitle=Low-latitude+auroras%3A+the+magnetic+storm+of+14%E2%80%9315+May+1921&amp;rft.au=E.W.Cliver&amp;rft.au=S.M.+Silverman&amp;rft.date=2001-03&amp;rft.genre=article&amp;rft.issue=5&amp;rft.jtitle=Journal+of+Atmospheric+and+Solar-Terrestrial+Physics&amp;rft.pages=523-525&amp;rft.volume=63&amp;rft_id=http%3A%2F%2Fdigitalcommons.unl.edu%2Fcgi%2Fviewcontent.cgi%3Farticle%3D1003%26context%3Dusafresearch%26sei-redir%3D1%26referer%3Dhttp%253A%252%252Fwww.google.com.au%252Furl%253Fsa%253Dt%2526rct%253Dj%2526q%253Dgreat%252520geomagnetic%252520storm%252520may%2525201921%2526source%253Dweb%2526cd%253D2%2526cad%253Drja%2526ved%253D0CDwQFjAB%2526url%253Dhttp%25253A%25252F%25252Fdigitalcommons.unl.edu%25252Fcgi%25252Fviewcontent.cgi%25253Farticle%25253D1003%252526context%25253Dusafresearch%2526ei%253DXXzQUP2tFaWhiAeZ34GYAw%2526usg%253DAFQjCNHr5qruFqjcc8OXq_Piiw9fn7X9pw%2526bvm%253Dbv.1355534169%252Cd.dGY%23search%3D%2522great%2520geomagnetic%2520storm%2520may%25201921%2522&amp;rft_id=info%3Abibcode%2F2001JASTP..63..523S&amp;rft_id=info%3Adoi%2F10.1016%2FS1364-6826%2800%2900174-7&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal"><span> </span></span></li></ul>
**1921 年 5 月磁暴**是威力巨大的一次日冕大量拋射對地球磁層造成影響的重大事件。它發生在 5 月 13 日至 15 日，是第 15 太陽週期的一部分。此一事件發生在廣泛的應用互聯互通的電氣系統和一般電器依賴跨基礎結構發達之前，即使造成地面電流的強度超過造成北美洲東部大停電的 1989 年 3 月磁暴，所受的影響也僅限於某些部門。在當時，科學家測量引起風暴的黑子在 5 月 10 日的大小是 94,000 乘 21,000 平方英里（131,000 乘 33,800 平方公里）。

在美國東部有許多地區都能看見極光，創造出明亮的夜空。電報服務在美國是因為保險絲被燒斷而被拖慢，到 14 日午夜才因設備損壞而幾乎完全中斷。另一面，由於電離層的活躍使得越洋的無線電傳輸信號增強。電燈似乎沒有受到明顯的影響。海底電纜也遭受磁暴的影響，歐洲也有電訊系統受到損壞的報導，南半球也受到影響。

## 相關條目

* 太陽風暴列表

## 參考資料

### 註解

### 書目

* JSTOR 40710695
* Solar Storm and Aurora of May 13, 1921. Solarstorms.org. [December 18, 2012]. （原始內容存檔於 2006-09-28）.
* Northern Lights Are Busy (PDF). New York Times. May 14, 1921: 10 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-03）.
* Aurora Borealis Halts Telegraph Service to City (PDF). The Atlanta Constitution. May 15, 1921: 1 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-03）.
* Henry K. Bunn. The Story The Week Has Told (PDF). The Atlanta Constitution. May 15, 1921: 8 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-04）.
* Tricky Aurora Snarls Up Wires (PDF). Chicago Daily Tribune. May 15, 1921: 1 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-03）.
* Aurora is Disturber (PDF). The Los Angeles Times. May 15, 1921: 1 & 2 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-03）.
* The Aurora Borealis (PDF). The Los Angeles Times. May 16, 1921: 14 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-03）.
* Aurora Borealis Effect on Wires Laid to Sun Spot (PDF). The Atlanta Constitution. May 16, 1921: 3 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-03）.
* Sunspot Credited with Rail Tie-Up (PDF). New York Times. May 16, 1921: 2 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-04）.
* Magnetic Tremors Expected to Pass Within 48 Hours (PDF). New York Times. May 16, 1921: 1 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-04）.
* Cables Still Show Effects of Aurora (PDF). New York Times. May 18, 1921: 12 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-03）.
* Electric Disturbances Affect French Wires: Aurora Not Visible, Its Absence Being Attributed to Atmospheric Conditions (PDF). New York Times. May 18, 1921: 12 [December 19, 2012]. （原始內容 (PDF) 存檔於 2016-03-04）.
* Magnetic Storms Don't Affect Radio (PDF). New York Times. May 26, 1921: 23 [December 19, 2012].
* S.M. Silverman; E.W.Cliver. Low-latitude auroras: the magnetic storm of 14–15 May 1921. Journal of Atmospheric and Solar-Terrestrial Physics. March 2001, **63** (5): 523–525 [December 18, 2012]. Bibcode:2001JASTP..63..523S. doi:10.1016/S1364-6826(00)00174-7. （原始內容存檔於 2019-11-08）.
1921年5月磁暴