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||What is needed is not a chemist, a physicist and engineer, who put the device and measure all that interests us. Yes, indeed, it would have so if the upper atmosphere of the Earth was the formation is said to have static. That is, if it does not change either, depending on the time or, depending on where in the Ground. But the first experiments on rockets and satellites have shown that the atmosphere is changing! I have very strong, and these changes are dependent on many very different factors. Only the main characteristics of the atmospheric gas - its density - has different forms depending on the time of day, latitude, solar activity, season, geomagnetic activity, and so on and these changes are very large. So at an altitude of 300 km the density varies from day to night in the 3 - 4 times, and at an altitude of 600 kilometers - 10 time. Very complex undergoes changes during the day, for a year, during solar cycle is such an important parameter as the electron density. It is clear that to study the upper atmosphere of the Earth only by experiments can not. No matter how many runs with sophisticated equipment we do, the result will reflect only a specific set of conditions. For example, the data we get for 11 hours on August 25 at a low solar activity at 35 °. sh. And what will be August 27 2 hours a night on the 10 ° S. sh.? What would happen if tomorrow the sun will flash? Obviously the amount of space experiments, which can hold humanity, because of their high cost and complexity, limited. It is impossible to enumerate all possible combinations of external factors: solar activity, time, place, etc. That means we need to understand how and why change the characteristics of the upper atmosphere, what These changes are caused by processes. And then we can construct atmospheric models considering all transient conditions and allowing to receive any interest We (as well as the national economy or scientists of other specialties) parameters.