冰岛上空的极光漩涡
(原标题: A Vortex Aurora over Iceland)
2022-04-04
浏览次数: 15
不，汽车没有被巨大的天空漩涡吸进太空的危险。一个原因是，漩涡实际上是极光，由于极光是由粒子从太空撞击地球产生的，所以它们不会产生真空。这种快速发展的极光现象是由太阳的日冕物质抛射引起的，日冕物质抛射距离地球足够近，在地球的磁层中引起了涟漪。极光上部的红色部分出现在250公里以上的高空，它的红光是由大气中的氧原子直接被入射的粒子激发而产生的。极光较低的绿色部分出现在100公里以上的高空，它的绿色光芒是由大气中的氧原子与第一能量的氮分子碰撞间接产生的。在100公里以下，几乎没有氧原子，这就是极光突然结束的原因。从侧面看，同心圆柱体描绘了一个戏剧性的极光日冕。这张特色图片是3月中旬在冰岛米瓦特湖（Lake Myvatn）上拍摄的一张3秒曝光照片。四月是全球天文学月
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No, the car was not in danger of being vacuumed into space by the big sky vortex. For one reason, the vortex was really an aurora, and since auroras are created by particles striking the Earth from space, they do not create a vacuum. This rapidly developing auroral display was caused by a Coronal Mass Ejection from the Sun that passed by the Earth closely enough to cause a ripple in Earth's magnetosphere. The upper red parts of the aurora occur over 250 kilometers high with its red glow created by atmospheric atomic oxygen directly energized by incoming particles. The lower green parts of the aurora occur over 100 kilometers high with its green glow created by atmospheric atomic oxygen energized indirectly by collisions with first-energized molecular nitrogen. Below 100 kilometers, there is little atomic oxygen, which is why auroras end abruptly. The concentric cylinders depict a dramatic auroral corona as seen from the side. The featured image was created from a single 3-second exposure taken in mid-March over Lake Myvatn in Iceland. April is: Global Astronomy Month
© Christophe Suarez