Copyright:Jeff Dai
(TWAN)
中文翻譯:
在一條街的盡頭發生了什麼？這裡看到的不是極光，而是光柱，這是一種通常較近的現象。在地球上的大多數地方，到處可見太陽柱，這是一種光的柱狀，似乎從太陽延伸而出，這是由於平坦的冰晶在上層大氣中反射陽光而造成的。通常這些冰晶在到達地面之前就會蒸發。然而，在寒冷的氣溫下，平坦的冰晶可能會在靠近地面形成，這時有時被稱為結晶霧。這些小冰晶可能會反射來自地面的燈光，而不是太陽。這張圖片不僅捕捉到了許多光柱，還展示了標誌性的獵戶座星座，拍攝地點是在中國最北的城市——莫賀。
原文:
What’s happening at the end of that street? Pictured here are not auroras but light pillars, a phenomenon typically much closer. In most places on Earth, a lucky viewer can see a Sun pillar, a column of light appearing to extend up from the Sun caused by flat fluttering ice-crystals reflecting sunlight from the upper atmosphere. Usually, these ice crystals evaporate before reaching the ground. During freezing temperatures, however, flat fluttering ice crystals may form near the ground and are sometimes known as a crystal fog. These small ice crystals may then reflect not the Sun but ground lights. The featured image captured not only numerous light pillars but also the iconic constellation of Orion, and was taken in Mohe, the northernmost city in China.
來源:NASA每日圖片
