埃特纳火山上空的荚状云


   2019-08-19 丨 天文·每日一图 丨 nasachina  丨  No Comment 丨  131

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2019 August 19

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 clouds forming and wavering as stars trail far in the distance.

埃特纳火山上空的荚状云
影像来源与版权:
Dario Giannobile

说明:火山上空发生了什么?虽然我们看到埃特纳火山正在喷发,但是这些云层与火山喷发无关。它们是荚状云,形成于潮湿空气被迫向上升至一座山或火山附近之时。上个月底,天文摄影师前往位于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,偶然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。赤热的火山熔岩在影像右侧流动。除了一些令人惊叹的影像外,还有一段该场景的延时视频显示,随着远处恒星的移动,荚状云正在形成和摇摆。

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