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A severe geomagnetic storm struck Earth on March 13, 1989. It occurred during solar cycle 22 and caused the collapse of Hydro-Québec's electricity transmission system. ==Geomagnetic storm and auroras== The geomagnetic storm causing this event was itself the result of a coronal mass ejection on March 9, 1989.〔(Geomagnetic Storms Can Threaten Electric Power Grid ) ''Earth in Space'', Vol. 9, No. 7, March 1997, pp.9-11 (American Geophysical Union)〕 A few days before, on March 6, a very large X15-class solar flare also occurred.〔http://sohowww.nascom.nasa.gov/hotshots/X17/〕 Three and a half days later, at 2:44 am EST 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, an unknown number of people worried that a nuclear first-strike might be in progress.〔(【引用サイトリンク】title=A Conflagration of Storms )〕 Others considered the intense auroras to be associated with the Space Shuttle mission STS-29, which had been launched on March 13 at 9:57:00 AM.〔(【引用サイトリンク】title=STS-29 )〕 The burst caused short-wave radio interference, including the disruption of radio signals from Radio Free Europe into Russia. It was initially believed that the signals had been jammed by the Soviet government. As midnight came and went, a river of charged particles and electrons in the ionosphere flowed from west to east, inducing powerful electrical currents in the ground that surged into many natural nooks and crannies.〔 Some satellites in polar orbits lost control for several hours. GOES weather satellite communications were interrupted, causing weather images to be lost. NASA's TDRS-1 communication satellite recorded over 250 anomalies caused by the increased particles flowing into its sensitive electronics.〔 The Space Shuttle Discovery was having its own problems: a sensor on one of the tanks supplying hydrogen to a fuel cell was showing unusually high pressure readings on March 13. The problem went away after the solar storm subsided. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「March 1989 geomagnetic storm」の詳細全文を読む スポンサード リンク
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