埃特纳火山喷发的光柱
(原标题: Light Pillar over Erupting Etna)
2025-02-24
浏览次数: 25
熔岩流能延伸到天空吗？不能，但熔岩流发出的光可以。其中一种效果很不寻常——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2月中旬的一个清晨用一张照片拍摄的。火山熔岩流上方的冰点温度在火山上方的空气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。
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Can a lava flow extend into the sky? No, but light from the lava flow can. One effect is something quite 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 during an early morning in mid-February. Freezing temperatures above the volcano's lava flow created ice-crystals either in the air 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.
© Davide Caliò