The wide-spread investigation to find the mechanism of ozone hole production in the Earth's atmosphere showed that a main reason is a human activity on the Earth. One of the most negative factors of this activity is a great number of technologies using freon. The freon molecules enter into reactions with the ozone molecules in the Earth's atmosphere and this process disturbs the dynamic balance of the atmospheric ozone concentration. There are other factors of the ozone layer disturbance too. Obviously the removal of all these factors is one of the possible ways to restore the atmospheric ozone layer. But this way of solving ozone problem is not the only possible way, and it is difficult to remove all these factors at once. The necessary level of the dynamic balance between the ozone generation and the ozone destruction can be restored by production of additional ozone molecules. The concept of Space Power Systems (SPS) is fruitful not only for solving power problems but for solving different ecological problems too. Specifically, the problem of the ozone layer restoration can be solved by means of the electromagnetic beam. The suggestion, set forth in Y. Kruzhilin's report, to restore the atmospheric ozone by using Laser-Solar Power Satellites is one of the first concepts of this kind [2], However the photochemical reaction is not the sole method of the ozone generation. As is known, the ozone can be generated by the discharge in atmospheric gas under laboratory conditions. The discharges for this purpose are specifically in the form of so-called "calm discharge" [3], This kind of atmospheric discharge requires reasonably low temperature and a microwave discharge belongs to the class of the calm discharges. Under natural situations the suitable conditions for the ozone generation in the Earth's atmosphere, as a rule, are during thunder-storms [4], This fact is an added reason for using a microwave beam for the ozone layer restoration. It is necessary to determine the characteristics of microwave beams for the ozone layer restoration by means of the atmospheric discharge. From the analysis of optimum conditions for the microwave break-down in gas it follows that the frequency of electromagnetic oscillations must be equal to the frequency of electron-atom collision [5]. At heights from 25 to 30 kilometers, the atmospheric pressure is equal to 1300- 2500 Pascals and the corresponding frequencies of electron-atom collision are equal to 20-50 GHz [5,6], Consequently, it is necessary to use this frequency' region for the atmospheric discharge with minimum consumption of microwave power. It is probable that the choice of the height for atmospheric discharge can be effected by way of frequency matching. Furthermore, in deciding on an operating microwave frequency, it is necessary to consider the following fact. The resonance absorption of microwave power by the oxygen molecules occurs at the frequency of 60 GHz and this process is accompanied by the dissociation and the excitation of oxygen [6].
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