埃特纳火山上的光柱
(原标题: Light Pillar over Volcanic Etna)
2021-11-15
浏览次数: 65
火山上方发生了什么？很不寻常的东西，火山光柱。更典型的是，光柱是由阳光引起的，所以在日出或日落时，看起来像一个明亮的柱子向上延伸。另一种选择是，其他的光柱——有些颜色相当鲜艳——被记录在街道和房屋的灯上面。然而，这个光柱是被火山喷发的炽热岩浆发出的红光照亮的。这座火山是意大利的埃特纳火山，这张特色照片是在6月中旬日落后几小时拍摄的。火山火山灰云上方的冰冻温度在火山上方的卷云或埃特纳火山喷出的冷凝水蒸气中形成了冰晶。这些冰晶——大部分朝向地面是平的，但在抖动——然后反射了火山火山口发出的光。探索你的宇宙：随机APOD生成器
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What happening above that volcano? Something very unusual -- a volcanic light pillar. More typically, light pillars are caused by sunlight and so appear as a bright column that extends upward above a rising or setting Sun. Alternatively, other light pillars -- some quite colorful -- have been recorded above street and house lights. This light pillar, though, was illuminated by the red light emitted by the glowing magma of an erupting volcano. The volcano is Italy's Mount Etna, and the featured image was captured with a single shot a few hours after sunset in mid-June. Freezing temperatures above the volcano's ash cloud created ice-crystals either in cirrus clouds high above the volcano -- or in condensed water vapor expelled by Mount Etna. These ice crystals -- mostly flat toward the ground but fluttering -- then reflected away light from the volcano's caldera. Explore Your Universe: Random APOD Generator
© Giancarlo Tinè