Copyright:
Paolo Lazzarotti
原文:
This was one strange sunset. For one thing, the typically round Sun appeared distorted, geometrically, and multiply layered. For another, some of these layers appeared unusually green. The Sun, of course, was just fine — its odd appearance was caused entirely by its light refracting in the Earth’s atmosphere. When layers of the Earth’s atmosphere are unusually warm, layers of the Sun may appear distorted or even seen multiple times. The effect is most strong nearest sunrise and sunset when terrestrial inversion layers occupy distinct altitudes above the horizon. Different colors of the Sun may also become deflected by significantly different amounts, so that the uppermost superior image may appear momentarily green — a phenomenon known as a green flash. The featured image was taken in February from Porto Venere, Italy, with San Pietro church situated in the foreground. Follow APOD on: Facebook, Google Plus, or Twitter
中文翻譯:
🌅 今晚的日落實在奇特！ 🌞
今次的日落有幾個特殊之處。首先，通常圓形的太陽竟然出現變形，呈現出幾何形狀和重疊的效果。其次，其中一些層次竟然顯得異常綠色。其實太陽本身並沒有問題，這奇特的外觀完全是因為太陽光在地球大氣中的折射所致。
當地球大氣層的溫度異常過高時，太陽的光線可能會出現變形，甚至看到多個影像。這種現象在日出和日落時最為明顯，因為地面逆溫層在地平線以上的不同高度上形成了明顯的層次。不同顏色的太陽光也會因為折射的程度不同而產生變化，讓最上方的影像瞬間變成綠色，這種現象被稱為「綠閃光」（green flash）。
這張照片是二月份在意大利波爾圖維內雷（Porto Venere）拍攝的，前景是聖彼得教堂（San Pietro church）。
#日落 #綠閃光 #波爾圖維內雷 #攝影 #自然之美 #天文現象 #SanPietro #Italy #naturephotography #sunsetmagic
來源:NASA每日圖片
