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总结
多家美媒援引美国国家海洋和大气管理局（NOAA）空间天气预报中心信息称，受太阳活动引发的强地磁扰动影响，20日（UTC日）出现G4级（严重）地磁风暴的可能性上升，极光今晚或将“异常偏南”可见，覆盖范围可能从美国北部扩展到更靠南的州（如马萨诸塞、北卡罗来纳等地亦被提及）。报道提醒公众选择远离城市灯光的开阔地点、面向北方观察，并注意地磁风暴可能对卫星、通信、导航及电网运行带来扰动风险。
正文
Northern lights may be visible unusually far south tonight. Here's where. The Washington Post Northern Lights Could Be Visible Across Much of the U.S. Tonight The New York Times G4 (Severe) Geomagnetic Storm Watch for 20 January UTC-Day NOAA Space Weather Prediction Center (.gov) Engage night mode: Aurora may be visible in North Carolina WRAL How to look for northern lights in Massachusetts tonight The Boston Globe
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