The Scientific Principles of Oriental Rainbow Sun and Western Rainbow Rain

The Scientific Principles of Oriental Rainbow Sun and Western Rainbow Rain

The scientific principles of the oriental rainbow, the sun and the western rainbow rain, we have seen many natural phenomena in our lives, and these phenomena have also become part of the basis for our observation of the weather, but these are still very clear to the older generation. The following is the scientific principle of rainbow rain in the east, the sun and the west.

Scientific principle of east red sun and west rainbow rain 1 There are often rainbows after rain in summer, but not in winter.

There are often thunderstorms or showers in summer, and the scope of these rains is not large. It is often raining in the sky here, and the sky over there is still shining with strong sunshine. Sometimes, after the rain, there are many small water droplets floating in the sky. When sunlight passes through these small water droplets, beautiful rainbows appear in the sky through reflection and refraction.

In winter, the weather is generally cold, the air is dry, and there are few opportunities for rain and showers. Most of it is snowfall, and snowfall does not form rainbows, so rainbows are unlikely to appear in winter. But in rare cases, when the sky has the right conditions to form a rainbow, it may also appear.

As the saying goes, "The sun rises in the east and it rains in the west." According to the direction of the rainbow, we can predict the future weather. The rainbow is in the east, which means there are fish in the atmosphere in the east of us. The atmosphere generally moves regularly from west to east, and the bad weather in the east will only move eastward and farther away from us. If the rainbow is in the west, it means that there is rain in the atmosphere in the west. With the movement of the atmosphere, rain easily falls on us.

When there is a rainbow in the east, it is not easy to rain locally; When there is a rainbow in the west, there is a great possibility of rain in the local area. The visibility of rainbow depends on the size of water droplets in the air. The bigger the water drop, the brighter the rainbow, and the smaller the water drop, the less obvious the rainbow is. Generally, in winter, the temperature is low, there are not easy to have water drops and showers in the air, and there are few opportunities, so there is generally no rainbow in winter.

East Red Sun West Rainbow Rain Scientific Principle 2 Rainbow is produced on the rain curtain in the sky opposite the sun, where there are countless small drops of water. They are like spherical lenses, the diameter of which is generally much larger than the wavelength of light. Therefore, colorless "white light" (that is, sunlight) composed of red, orange, yellow, green, cyan, blue and purple lights with different wavelengths (about 0.76 micron to 0.39 micron) will be refracted twice and reflected once when passing through them.

The deflection angle of light entering spherical water droplets is different at different angles. Therefore, a beam of light is dispersed. These scattered beams are hard to see with naked eyes, and only the part that comes out from the minimum deflection angle can be seen by people. Because light with different wavelengths has a certain minimum deflection angle, each color of light can see an arc, that is, a rainbow.

If you see a rainbow in the western sky when the sun rises in Ran Ran, it indicates that it will rain that day; On the other hand, if a rainbow appears in the eastern sky when the sun goes down, it indicates that it will be sunny tomorrow. Actually, the reason is not complicated. A rainbow appears around the sun's anti-sun point, indicating that there is a cloud and rain area there.

Most of China is in the middle latitude, mainly controlled by the westerly belt, so the cloud and rain areas generally move from west to east with the westerly circulation. Rainbow appears in the western sky, indicating that the cloud and rain area will move over the local area and it often rains. On the contrary, when a rainbow appears in the eastern sky, it means that the cloud and rain area has moved eastward from the local sky, and the weather tends to clear up.

But why is there the opposite of the above situation: "There is a rainbow in the west, the sun in the east and rain in the east"? In midsummer, the subtropical high ridge in the western Pacific extends northward and westward, and the northeast trade winds south of 30 north latitude will also expand northward.

At the same time, affected by tropical cyclones (sometimes developed into strong tropical storms or typhoons), it will cause strong winds and heavy rains in the coastal areas ranging from 10 to1; In inland areas, it is affected by the typhoon reversal trough or the low pressure after the typhoon landed.

In addition to the maximum average wind force of 6-7, it will also produce precipitation with moderate or above intensity. At this time, due to the influence of intermittent eastward (including northeast or southeast) airflow, there will also be a cloud and rain area from east to west. Therefore, there may be a phenomenon that the sun shines in the west and it rains in the east.

Based on the above, if people can often and carefully observe the phenomena in the atmosphere, they will master some special laws. For example, from April to early July, if you see a rainbow in the western sky after sunrise, you should consider the rainy weather in the next few days. If you see Donghong at night, the probability of sunny days is great;

However, from late July to August, the eastern rainbow may be affected by typhoon, so it is necessary to prevent strong thunderstorms at this time. But paying attention to the weather forecast and arranging production and life in time can better avoid the losses caused by bad weather.

Donghong Sun Xihong Rainology Principle 3 What is a rainbow?

Rainbow is a natural weather phenomenon. In the early summer and autumn, before and after the rain, when there are many small water droplets floating in the air, when the sun shines on these small water droplets, the original direction of sunlight is changed due to refraction, and the white sunlight synthesized by seven colors is scattered, making it become seven colors again;

Then through the reflection of the ground, a beautiful and bright arc of light is formed from the outside to the inside, which is arranged in the order of red, orange, yellow, green, cyan, blue and purple. This is the rainbow. The color and width of the rainbow are related to the size of water droplets. The bigger the water drops in the air, the brighter the color of the rainbow and the wider the ribbon. The smaller the water drop, the darker the rainbow and the narrower the ribbon.

"Rainbow in the East, Rainbow Rain in the Sun and the West"

The appearance of rainbow is closely related to the local weather changes in the future. The weather proverb "The sun shines in the east and the rain falls in the west" summarized by the working people in our country is scientific. In the temperate zone where we live, the upper air flow moves regularly from west to east. Therefore, the change of weather in the future is closely related to the nature of airflow in the west.

"East Red Sunrises" means that when a rainbow appears in the east in the evening, it indicates that it will be sunny the next day, because East Red means that although there are many water drops in the air in the east and the humidity is very high, the rain area will continue to develop eastward without passing through the local area, so it won't rain there. And the corresponding dry air in the west will move to the local area.

So it will be sunny the next day. "Rain on the rainbow in the west" means that a rainbow appeared in the west in the morning and it is going to rain soon. Because there are a lot of water droplets in the western sky, these water droplets will develop eastward and move to this area.

In addition, with the rising of the local sun, evaporation intensifies, and the water vapor at low altitude rises to high altitude and meets the water droplets at high altitude, which makes the water droplets at high altitude expand and increase, which is easy to cause rainy weather.