Earthquake precursor phenomenon

This weather phenomenon is called "solar halo", which is an uncommon but normal meteorological phenomenon. The reason is that there is a cirrostratus composed of ice crystals in the sky. After the sunlight is refracted by these clouds, it is decomposed into red, yellow, green, purple and other colors.

It is understood that the occurrence of "solar halo" is related to the angle of the sun and clouds. First of all, there needs to be a "cirrus cloud". This cloud is more than 0/0000 meters above the ground, and the temperature in the cloud is about MINUS 30℃. The small water droplets gathered in the cloud condense into larger granular ice crystals. At this time, when the sun shines at a right angle, due to refraction and reflection, the spectacle of "solar halo" appears.

Cirrus clouds with this ice crystal structure are usually clouds produced when cold and warm air meet. Later, the clouds became thicker and developed into nimbostratus, so "halo" was a sign of the coming storm. There is a folk saying that "the sun is dizzy and it rains in the middle of the night, and the moon is dizzy and windy at noon", that is to say, the sun is dizzy during the day and it rains in the middle of the night; If there is a halo at night, there will be wind at noon the next day. The phenomenon of "solar halo" can be said to be a weather forecast, but it is not always accurate.