Today (December 7) evening, a "dragon" cloud appeared in the beijing sky. Coinciding with the evening peak, a circle of friends "photo contest" quickly opened——
Netizens photographed the clouds reflected in the water, coordinates: Beijing Houhai ↓
Cloud ↓from the perspective of North 3rd Ring West Road
Passengers who had just landed in Beijing were surprised by this. Coordinates: Beijing Daxing International Airport↓
Netizens in Hebei have also posted "the same cloud". Coordinates: Baoding ↓
The cloud in Tianjin should also have a name ↓
According to the official microblog of the Beijing Meteorological Bureau, it is actually a trail cloud left by the Kuaizhou-1 A carrier rocket launched at 16:52 today.
China's aerospace science and industry also came to "claim"↓
How did it come into being?
You can say that you are very lucky to see this cloud today, because the "track cloud" is not available every launch, and the rocket launch time is usually 30 minutes before sunrise or 30 minutes after sunset.
It was formed thanks to the "Twilight Effect". The rocket rises in the night sky and gradually leaves the shadow area of the earth, the rocket exhaust is illuminated by the high-altitude sunlight, and the exhaust remains in the shadow area. At this time, for Earth observers, it is already dark, and the rocket exhaust is illuminated in the night sky. In addition, the high-altitude wind blows the exhaust gas into a spiral, and the tiny particles in the air are decomposed into red and blue by the sunlight, and the twilight effect is even more beautiful.