挪威上空的极光和光柱
2022年2月8日
Aurora and Light Pillars over Norway
Image Credit & Copyright: Alexandre Correia
Explanation: Which half of this sky is your favorite? On the left, the night sky is lit up by particles expelled from the Sun that later collided with Earth’s upper atmosphere — creating bright auroras. On the right, the night glows with ground lights reflected by millions of tiny ice crystals falling from the sky — creating light pillars. And in the center, the astrophotographer presents your choices. The light pillars are vertical columns because the fluttering ice-crystals are mostly flat to the ground, and their colors are those of the ground lights. The auroras cover the sky and ground in the green hue of glowing oxygen, while their transparency is clear because you can see stars right through them. Distant stars dot the background, including bright stars from the iconic constellation of Orion. The featured image was captured in a single exposure two months ago near Kautokeino, Norway.
Favorite sky half: Left half (aurora) | Right half (light pillars)
Tomorrow’s picture: to circle a dying star
挪威上空的极光和光柱
影像提供与版权: Alexandre Correia
说明: 你偏爱那一半的天空呢？左半的天空，有来自太阳的高能粒子撞击地球的高层大气后，所产生的明亮极光。右半的天空，有数以百万计飘落的微小冰晶反射地面的灯光，所形成的明亮光柱。而位在影像中央的天文摄影者，则呈现你可做的抉择。右侧的光柱 之所以是垂直的柱状结构，源自缓缓飘落冰晶的扁平面大多与地面平行，因此忠实反射地面灯火的炫光与色泽。而覆天盖地的明亮极光，其泛绿的色泽来自原子氢的辐射，同时也具有颇高的透明度，因为极光后方的恒星清楚可辨。在散布于背景各处的遥远恒星之中，包括猎户座标志性的亮星。这幅单曝光主题影像，是在2个月前摄于挪威．凯于图凯努镇的近郊。
明日的图片: to circle a dying star