| Summary: | Global warming in the future is an existential threat to human civilization. To prevent further changes in the Earth's climate is intended of space system for regulate the temperature of Earth's atmosphere, proposed of G.A. Sizentsev. In this system, the main role is played by the solar-sailing ship (SSS) arranged in a Lagrange point L1 of the Earth-Sun system. Due to the large area of sails SSS, drifting in the plane normal to the flow of sunlight, reduces the amount of solar radiation incident on the Earth. For practical implementation of space system for regulate the temperature of Earth's atmosphere is necessary to solve complex problems related primarily to the efficiency of attenuation of solar radiation flux. In this paper we study the solar limb darkening on the reduce of the outgoing radiation flux from sun with using the SSS. On the basis of well-known law of solar limb darkening, expressions are obtained for attenuation of the radiation flux when the SSS is at the center of the solar disk, and with deviation the SSS from center of the solar disk at a certain angle. Evaluation is made for the total stream and separate sections the spectral range (from average UV- to the near IR-range). Found that attenuation will decrease at the displacement of SSS to solar disk center, because from there comes the most intense radiation flux. For constant attenuation values of the radiation flux is necessary to ensure a stable position of the SSS with respect to the center of the solar disk, or design should allow the SSS to regulate the transmission amount of the radiation flux. Is shown, that the greatest attenuation occurs in the spectral range of 260 ... 300 nm, corresponding to middle UV-range. Currently, there are published data on the significant effect of fluctuations in the UV radiation on the Earth's climate. Conclusion, that more research is needed of possible effects of reduce UV-radiation on the Earth's climate when regulating of the solar constant with the SSS.
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