Seek the difference between "dizzy" and "Hua"

Simply say a few points, I hope it will help you!

1. Halo and China appear in different periods when the weather turns from sunny to cloudy to rainy. Clouds of different heights can still be distinguished. The practice of contemporary meteorological science shows that when the weather turns from sunny to cloudy to rainy, people first see cirrostratus, and then there will be low clouds in the sky, which will produce rainfall. When cirrostratus will appear depends on whether low clouds develop. If they do this, the result will be rain. That is, cirrostratus usually appears at the front of cyclone. Hundreds of kilometers behind the front is the cloud and rain area caused by the front. As the ground front approaches, the weather will be accompanied by lower and lower clouds, stronger winds and precipitation. Therefore, the appearance of solar halo and lunar halo means the coming of stormy weather. There are some sayings, such as "the sun is dizzy in the middle of the night, and it rains at noon", "the moonlight flails, and the heavy rain falls", and "the moon is hairy and the heavy rain rushes into the trench". Of course, this doesn't mean that the solar halo must be a sign of rain, and the lunar halo must be windy, which depends on other weather conditions. If only the edge of the cyclone passes through here, it may not rain, but the clouds thicken, the wind increases and the wind direction changes. There is also a cirrostratus on the outer edge of tropical cyclones, which will also make you dizzy. Therefore, in the typhoon season, when cirrus clouds and halo appear in the sky at low latitudes, it may be a sign that a typhoon is coming.

2. Most clouds are ice crystals. Ice crystals are mainly hexagonal columns and hexagonal plates. On one side of the hexagon, each internal angle is 120, which is the included angle between two adjacent sides, the included angle between two alternate sides is 60, and the included angle between sides of the hexagon is 90. Halo is formed because sunlight and moonlight are refracted or reflected by ice crystals in clouds, and then reach people's eyes. The refraction of light passing through an ice crystal is the same as that of light passing through a prism. And the light passing through the prism is secondary refraction (retroreflection)? Like the difference between a neon and a rainbow. Because sunlight is reflected twice by water droplets, it loses much more energy than once, so the brightness of neon is much darker than that of rainbow, so it is also called secondary rainbow, which is above the main rainbow and below it. The color distribution in the main rainbow is external red and internal purple, and the color distribution in the auxiliary rainbow is external ultraviolet and internal red.

You know that Huaduo is mainly produced in stratocumulus and altocumulus, and their heights are mostly between 2500 and 5000 meters. If this cloud is thickened by the system, it will often form precipitation. As the saying goes, "Dahua is sunny, Xiaohua is rainy". China is produced by the diffraction of water droplets (ice crystals or raindrops) in clouds by sunlight or moonlight. Therefore, the smaller the droplet diameter, the larger the halo. China varies in size. It shows that when the apparent radius of China changes from small to large, the dispersion of water droplets in the cloud decreases, which indicates sunny days. When the apparent radius of China changes from large to small, there are more and more water droplets in the clouds, which indicates rainy weather. The more uniform the droplet size, the brighter the halo color. Therefore, by measuring the opening angle of China color ring, the average size of cloud droplets can be roughly estimated.