F.4 Cladis & McCormac "Emission of IR Radiation from the SPS." A workshop was held at Battelle Pacific Northwest Laboratory on 23-24 May 1979 on the effect of SPS on optical, IR and radio astronomy (Dr. R.A. Stokes, Chairman). The conclusion was that IR radiation from SPS, while large in absolute power, is unimportant from an overall standpoint. This note should be considered in the context of the workshop, the report of which is in preparation (Stokes, 1979). EMISSION OF INFRARED RADIATION FROM THE SOLAR POWER SATELLITE John B. Cladis and Billy McCormac Lockheed Palo Alto Research Laboratory An estimate is made of the black-body temperature and radiance of the SPS in the infrared. This estimate indicates that the SPS will appear as a bright IR star, but that the effect of the IR radiation on the earth's atmosphere will be negligible. The black-body temperature is given approximately by the equation, Here it is assumed that the surface A absorbs 100% of the solar energy and that 10% is radiated to earth by microwaves. Taking £ = 0.95, the solution of (1) gives T = 329 K. —3 2 The radiance, p, at this temperature is 5 x 10 watts/cm /2tt rad at the peak of the black-body radiation (X « 9 p). At the surface of the earth the IR intensity, I, is
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