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回复:【2015-03-15】Atlas 5号发射成功:NAS

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AURORAS OVER THE USA: A unusual stream of solar wind is buffeting Earth's magnetic field, causing http://G1-class geomagnetic storms around the poles. The stream is unusual not only because it is very fast (700+ km/s), but also because it has a series of shock waves or "transients" embedded in it--at least 3 so far. Sudden changes in solar wind pressure have sparked auroras in multiple US states, like these over Ellensburg, Washington, on Nov. 3rd:

"Last night was amazing," says photographer Lia Simcox. "I hurried up to my favorite spot and was not only greeted with Northern Lights, but snow as well! What an absolutely gorgeous sight."


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    128楼2015-11-07 11:53
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      从2014年1月到6月间,欧洲航天局蜂群卫星群测量地球磁场的变化。这些变化以源自地核的磁场信号为基础。红色阴影表示磁场加强的地区,蓝色显示磁场变弱的地区。测量单位是毫微特斯拉。






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