• usage of the carbon-composite frame as the bearing construction improves specific weight characteristics of the frame from 3.6 to 3.2 kg/m2 up to 2.4 kg/m2 (i.e. 1.5 times); • design of a reliable locking mechanism of the solar array, folding mechanisms for putting the solar array into the operating position using the material with "memory effect". At the AUOS-SM we shall carry on research of the photoelectric plant with solar energy concentrators. We propose to solve the problem of increasing the life and efficiency of energy conversion and to reduce costs of power systems. The installation comprises four experimental panels with PVs made of Si and GaAs, coefficients of concentration are 3, 4, 30, 60. One of the most important experiments of the Soviet-French space project "Arcad" was realized with this satellite which was launched on the 21 of September, 1981 into the orbit with the following parameters: • the height of the apogee = 2012 km; • the height of the perigee = 408 km; • inclination = 82.5 degrees; • the period of rotation = 109.5 min. The aim of the project was to carry out the wide complex research of physical processes in magnetosphere and in the polar high atmosphere and ionosphere, to study magnetospheric - ionospheric ties. Electromagnetic purity of a satellite plays an extremely important part in relatively precise measurements ( with an accuracy to 10 nanoTesla). Special attention was paid to the providing of the solar PV and batteries and the whole system of electric supply with electromagnetic purity. Analysis of space vehicles shows that the demands for power have increased, because there are increasingly more tasks to be performed, higher quality information is needed, more on-board processing is performed and more data is transmitted. Power requirements of the CIS space programs are 10 to 100 kW daily. Solar Power Systems (SPS) with the above mentioned power level requires a special approach to their development connected with the following considerations: • limitation in weight and volume occupied by a power installation under the rocket booster fairings; • financial limitations existing for space programs; • limitation in the possibility of achieving high specific characteristics of planar solar cells in acceptable period of time. On the basis of analysis done under the guidance of M.B.Kagan, the specific power of photovoltaics will increase to around 140 to 170 W/m2 for silicon PVs and 190 to 220 W/m2 for gallium arsenide PVs by the year 2000. A great contribution to the solution of the problem of PV improvement has been made by the scientists of St.
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