Copyright:
Mia St�lnacke
原文:
It appeared, momentarily, like a 50-km tall banded flag. In mid-March, an energetic Coronal Mass Ejection directed toward a clear magnetic channel to Earth led to one of the more intense geomagnetic storms of recent years. A visual result was wide spread auroras being seen over many countries near Earth’s magnetic poles. Captured over Kiruna, Sweden, the image features an unusually straight auroral curtain with the green color emitted low in the Earth’s atmosphere, and red many kilometers higher up. It is unclear where the rare purple aurora originates, but it might involve an unusual blue aurora at an even lower altitude than the green, seen superposed with a much higher red. As the Sun continues near its top level of surface activity, colorful nights of auroras over Earth are likely to continue. Follow APOD on: Facebook, Google Plus, or Twitter
中文翻譯:
🌌 在3月中，強勁的日冕物質拋射 (Coronal Mass Ejection) 對準了地球的磁通道，造成了近年來最激烈的地磁風暴之一。持續出現的極光 (auroras) 在地球磁極附近的多個國家都能見到。這幅在瑞典基律那 (Kiruna) 捕捉的圖片展現了一道異常筆直的極光簾，低層的綠色光芒來自地球大氣中的低層，而紅色光芒則在數公里的更高處排放。至於罕見的紫色極光來源尚不清楚，但可能與更低高度的藍色極光有關，並與更高的紅色極光重疊。隨著太陽活動接近高峰，五彩繽紛的極光之夜可能會持續出現。
#極光 #地磁風暴 #日冕物質拋射 #基律那 #瑞典 #天文奇觀 #自然之美 #彩色極夜 #地球磁極
來源:NASA每日圖片
