What is artificial rainfall?
1. How to make artificial rainfall
To actually drop the water from the sky to the ground and prevent it from running away in vain. This is artificial rainfall, but it is a more scientific name. It is artificial rainfall enhancement, and there are two methods: aerial and ground operations.
Aerial operations use aircraft to spread catalysts in the cloud. Ground operations use anti-aircraft guns and rockets launched from the ground. The shell exploded in the cloud, burning the silver iodide in the shell into smoke and spreading it into the cloud. After the rocket reaches the height of the cloud, the silver iodide agent begins to ignite, and as the rocket flies, smoke is spread along the way. Generally, stable weather is selected for aircraft operations to ensure safety. Generally, anti-aircraft artillery and rocket operations are relatively extensive.
2. Conditions for artificial rainfall
Artificial rainfall must have sufficient conditions. Generally, the generation of natural precipitation requires not only certain macroscopic weather conditions, but also microphysical conditions in the clouds. For example, there must be large water droplets in warm clouds above 0℃; ice crystals must be present in cold clouds below 0℃. Under these conditions, no matter how good the weather situation is or how good the cloud conditions are, it will not rain. However, under natural conditions, such microphysical conditions are sometimes not available; sometimes they are available but not sufficient. The former produces no precipitation at all; the latter receives very little rainfall. At this time, if artificial ice nuclei are artificially sown into the cloud, the ice water transformation process of condensation or sublimation will occur in the cloud, and then with the help of the natural collision process of water droplets, rainfall can be produced or the amount of rainfall can be increased. The role of catalysts in clouds, to use an inaccurate metaphor, is like adding salt to the tofu, causing precipitation that would not otherwise occur to occur and increasing the intensity of precipitation that has already occurred.
3. Artificial rainfall is harmless to humans
The principle of artificial rainfall is to make the water droplets in cumulonimbus clouds increase in size and fall down. Anti-aircraft artillery artificial rainfall is to make the water droplets containing silver iodide The artillery shells hit an altitude of 4,000 to 5,000 meters where there are a large number of cumulonimbus clouds. Silver iodide diffuses at high altitudes and becomes the condensed nucleus of water droplets in the clouds. The water droplets quickly condense around them and reach a certain volume before falling. When silver iodide is transported to high altitudes by cannonballs, it will spread into small particles that are difficult to distinguish with the naked eye.
Compared with the huge amount of water droplets, the silver iodide rising into the sky is just a drop in the ocean. Too much will not only not increase rain but will "scare away" cumulonimbus clouds. Therefore, in such a disparity situation , people will never feel the presence of silver iodide.
In addition, after the shell shrapnel explodes at high altitude, it will turn into less than 30 grams, or even only two or three grams of debris and fall to the ground. The area where it falls is the no-man's land that has been tested and calculated before. , will not cause harm to the human body. At the same time, artificial rainfall has a history and the technology is relatively mature, so people do not have to have doubts about artificial rainfall.