Astronomy Picture of the Day——埃特纳火山上空的荚状云

Lenticular Clouds over Mount Etna 
Image Credit & Copyright: Dario Giannobile

Explanation: What's happening above that volcano? Although Mount Etna is seen erupting, the clouds are not related to the eruption. They are lenticular clouds formed when moist air is forced upwards near a mountain or volcano. The surreal scene was captured by chance late last month when the astrophotographer went to Mount Etna, a UNESCO World Heritage Site in Sicily, Italy, to photograph the conjunction between the Moon and the star Aldebaran. The Moon appears in a bright crescent phase, illuminating an edge of the lower lenticular cloud. Red hot lava flows on the right. Besides some breathtaking stills, a companion time-lapse video of the scene shows the lenticular cloudsforming and wavering as stars trail far in the distance.

埃特纳火山上空的荚状云

火山的上空发生了什么？虽然我们看到的好像是埃特纳火山正在喷发，但其实这些云层与火山毫无关系。它们是荚状云，形成于潮湿空气被迫向上升至火山附近时。上个月底，摄影师在意大利西西里岛的联合国教科文组织世界遗产地——埃特纳火山，捕捉到了毕宿五合月这一超现实景象。月球正处于明亮的新月阶段，照亮了较低荚状云的边缘。赤热的火山熔岩在图像右侧流动。

高清原图地址：

https://apod.nasa.gov/apod/image/1908/EtnaCloudsMoon_Giannobile_1600.jpg

近期文章：

Astronomy Picture of the Day——超越

Astronomy Picture of the Day——老鹰星云的精灵

Astronomy Picture of the Day——仙王座内的象鼻星云

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