What do you mean by solar halo? What does the solar halo portend?

Solar halo is an atmospheric optical phenomenon. When there is cirrostratus, there are countless ice crystals floating in the sky. When sunlight passes through cirrostratus, it will be refracted or reflected by ice crystals to form a solar halo. The greater the ice crystal content in the cloud, the more obvious the halo. We can usually observe this phenomenon with the naked eye.

The appearance of solar halo often indicates that the weather may change in a short time, but it is not absolute. There are small ice crystals in the sky, and sunlight will be refracted to form a solar halo. The formation of small ice crystals is because the rain in the sky meets low temperature, so there is a solar halo, which indicates that there is rain in the sky, so the solar halo has certain reference significance for weather changes.

The meaning of sun halo and rain in the middle of the night, the wind of the moon halo at noon, sun halo and moon halo can be regarded as precursors of weather changes, which means that if there is sun halo, it may rain in the middle of the night, so the appearance of sun halo indicates that it may turn cloudy or rain. If there is a halo, it means there may be wind at noon the next day. The ancients discovered this law long ago, so they got the proverb "it's sunny when it rains, and it's dizzy when it rains on the moon".

Explanation of solar halo

The viewing angles of the solar halo radius are usually 22 degrees and 46 degrees. People can usually observe the phenomenon of "solar halo" with the naked eye. The greater the ice crystal content in the clouds, the more obvious the halo, which is easy for people to observe. On the other hand, a "solar halo" cannot be formed, or even if it is formed, it cannot be clearly observed on the ground.

Don't watch with the naked eye for a long time when the solar halo appears, so as not to burn your eyes. When it's going to rain, cirrus clouds like bird feathers often appear in the sky, and then a rainy cirrostratus appears in the air about 6 kilometers below the cirrus clouds. Due to the low temperature, the water droplets in the cloud become small ice crystals in the shape of hexagonal prisms. When the sun's light energy passes through the clouds, it will be refracted to small ice crystals. It seems that there is a circle around the sun, and the spectrum is from the inside out. This is a solar halo.

Solar halos are usually ring-shaped or arc-shaped, with seven colors like a rainbow: red, orange, yellow, green, blue, indigo and purple.

Refer to the above content: Baidu Encyclopedia-Solar Halo