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||Almost every day there are reports of new launches large and small satellites, geophysical and meteorological rockets. And on each satellite, the each missile installed sophisticated scientific instruments. What does it do? In mainly to study the characteristics (or parameters) of the environment. A Wednesday that surrounds them - this is the upper atmosphere of the Earth and the adjoining space space. Total gas density at a given altitude, the number of neutral and charged particles, their "passport" that is, their chemical identification, the temperature of the atoms, molecules and ions - this is not all of the parameters that need to be examined during the rocket and satellite experiments. Knowledge is the atmosphere and space necessary to address specific applications. Enormous influence on the development of the Earth's ionosphere radio in the world. Without it - not have been possible radio on short and ultrashort waves. The slightest changes in the characteristics of the ionosphere affect the quality of the radio, the safety radio communications. The rapid development in the past decades radio radar, radio navigation, and other members of the "radiosemeystva" requires more precise knowledge of the characteristics of the ionized shell of the Earth, and not only at the moment (Diagnosis), and, if possible, well in advance - for hours, days and months ahead (Forecast). How to solve challenges to meet these demands and what role Aeronomy is played, we will describe in one paragraph of the book. The upper atmosphere of the Earth roam dozens of satellites. As calculate the lifetime of each of them? How to choose the orbit to the flight altitude was the smallest, but the satellite with "lived" to the whole planned period? To answer These and many other questions must be firmly applied research to know distribution of density and temperature of the upper atmosphere. So, to know the characteristics of the upper atmosphere, the ionosphere and the adjacent space is needed. This - the practical demands of today's days. But where is there chemical processes?