On January 26, the weather in the Ergun area of ​​Inner Mongolia quickly "changed its face", and the minimum temperature dropped from yesterday's minus 23 to minus 31°C.

Take the "Cooling Express" along with the phenomenon known as the "Three Days of the Same Glory".

  Two "little suns" hang symmetrically on the left and right sides of a large round sun, and the large aperture circles the two small suns together, forming a "three-day same glory" spectacle centered on the big sun.

The big sun shines with the sun's rays, the two small suns are like rainbows after the rain, shining with seven colors of light, and a brightly colored ink painting is laid out in the blue sky, which can be described as a spectacle.

  According to meteorological experts, this is an optical phenomenon called a sundog and is related to the climate environment.

When the humidity in the cold atmosphere is too high, thin cirrus clouds carrying a large amount of water vapor will naturally condense hexagonal ice crystals. When they are blown neatly by a stable airflow, they reflect and refract sunlight, which is prone to sunshades.

  (Zhang Wei and Chen Feng highlight)

Editor in charge: [Zhang Aolin]