亚速尔群岛上空的彩虹气辉
(原标题: Rainbow Airglow over the Azores)
2025-06-03
浏览次数: 30
为什么天空会像一个巨大的重复彩虹一样发光？大气光。现在，空气一直在发光，但通常很难看到。然而，像即将来临的风暴这样的扰动可能会在地球大气层中引起明显的涟漪。这些重力波是空气中的振荡，类似于将岩石扔进平静的水中所产生的振荡。长时间的暴露几乎沿着气辉的垂直壁，可能使起伏的结构特别明显。好的，但是这些颜色是从哪里来的呢？深红色的辉光可能来自87公里高的OH分子，被来自太阳的紫外线激发。橙色和绿色的气辉很可能是由钠原子和氧原子稍微高一些引起的。这张特色图片是在攀登葡萄牙亚速尔群岛的皮科山时拍摄的。地光源起源于大西洋的Faial岛。通过这条带状气辉，我们可以看到壮观的天空，我们银河系的中央带在图像中心，而靠近左上角的仙女座星系M31。APOD满30岁了！： 6月11日在安克雷奇举行免费公开讲座
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Why would the sky glow like a giant repeating rainbow? Airglow. Now, air glows all of the time, but it is usually hard to see. A disturbance however -- like an approaching storm -- may cause noticeable rippling in the Earth's atmosphere. These gravity waves are oscillations in air analogous to those created when a rock is thrown in calm water. The long-duration exposure nearly along the vertical walls of airglow likely made the undulating structure particularly visible. OK, but where do the colors originate? The deep red glow likely originates from OH molecules about 87 kilometers high, excited by ultraviolet light from the Sun. The orange and green airglow is likely caused by sodium and oxygen atoms slightly higher up. The featured image was captured during a climb up Mount Pico in the Azores of Portugal. Ground lights originate from the island of Faial in the Atlantic Ocean. A spectacular sky is visible through this banded airglow, with the central band of our Milky Way Galaxy running up the image center, and M31, the Andromeda Galaxy, visible near the top left. APOD Turns 30!: Free Public Lecture in Anchorage on June 11
© Miguel Claro (TWAN); Rollover Annotation: Judy Schmidt