Five omens of solar halo

The five signs of solar halo are as follows:

1, existence of high-level clouds: Solar halos generally appear when high-level clouds (such as cirrus clouds and chardonnay clouds) appear. Because these clouds contain a lot of water droplets or ice crystals, they can effectively refract and scatter sunlight and form a solar halo.

2. Abnormal sky color: When a solar halo occurs, it usually shows an unusual sky color. The appearance of halo or light spot will make the sky appear red, yellow and orange, which is different from the normal blue sky.

3. Color halo or light spot: The most obvious feature of solar halo is the appearance of color halo or light spot around the sun. These colored rings or spots are usually centered on white, and the periphery is red, orange, yellow, green, blue and purple, showing a beautiful and spectacular scene.

4. Weather change: Solar halos often appear when the weather is about to change. For example, there may be a low-pressure system near the front, or the coming rain, storm and other weather phenomena will increase the existence of water droplets or ice crystals, which will lead to the emergence of solar halo.

5. Time and place: Solar halos usually occur at certain times of the day, mainly in the morning and evening. This is because the altitude angle of the sun is low, and the path of light passing through the atmosphere is longer, so it is easier to refract and scatter. In addition, the appearance of solar halo is also related to location. In some specific geographical areas, it is easier to observe solar halo due to the influence of climate and environmental conditions.

Explanation of halo

Halo is an optical phenomenon formed by the refraction or reflection of sunlight or moonlight by ice crystals suspended in the atmosphere. When light enters the ice crystals in cirrostratus, it is refracted twice and dispersed into light of various colors in different directions. When there is cirrostratus, there are countless ice crystals floating in the sky. Ice crystals in the same circle around the sun can refract the same color light into our eyes, forming a halo of internal infrared violet.

Halo is usually ring-shaped or arc-shaped, with seven colors: red, orange, yellow, green, blue, indigo and purple. The reflection of ice crystals irradiated by the sun on human eyes is called "solar halo", and the reflection of ice crystals irradiated by the moon on human eyes is called "lunar halo". Ice crystals in the atmosphere are usually brought by cirrus clouds. When sunlight enters the ice crystals, it will be reflected by human eyes, producing circular or arc coils, usually with red light in the inner ring and purple light in the outer ring.