In the afternoon of December 10, a beautiful sun-phantom landscape appeared over Beijing. There were "little suns" on the left and right sides of the sun. The sky was colorful at noon.Some meteorological experts explained: The big ring is a halo, and the bright spots on both sides are called holidays, also called sundogs.
This optical effect is caused by the refraction of sunlight by high-altitude ice crystals.
This unique sun-catching landscape has aroused heated discussions among netizens.
Some netizens commented: Dehydration! Who responded to the legendary three-day volley? Earth coordinates exposed?
Some netizens responded humorously: If you are bold and confuse the public with your monstrous words, you will be captured by a guard wearing a royal uniform and thrown into a prison!
It is understood that sundog is an atmospheric optical phenomenon called "double sun". It occurs because there are a large number of tiny hexagonal ice crystals distributed in the sky. Under certain conditions, when sunlight shines on these ice crystals, refraction occurs, forming a corona around the sun.
The occurrence of the "solar dog" phenomenon requires very stringent conditions to be met. First of all, there must be cirrostratus clouds. Secondly, the cloud layer must be thin and the light transmittance must be good. In addition, the angle between the sun, the ice crystals and the observer must be just right. If it is slightly off, it cannot be seen.
So, will there still be three suns appearing over Beijing today?