cloudless night. The effect will occur whenever the specular beam from any of the 60 satellites passes sufficiently near an observing site: presumably, once per night for several minutes for the few days preceding and following the direct illumination of the site by each satellite. D. SATELLITE THERMAL INFRARED EMISSION Both the GaAlAs and the Si cell solar blankets absorb about 50 GW more power as sunlight than they deliver as electrical output. This excess power is radiated in the infrared from both sides of the blanket. For an assumed Lambertian pattern, power incident per unit area on Earth is The GaAlAs cells cover about half the area of the array (the rest in concentrator) and operate at 125°C, which is associated with a blackbody peak at 6.9 microns. The Si cells operate at 36.5°C for a blackbody peak at 8.8 microns. The actual spectral distribution of the radiation will depend on the wavelength dependence of solar cell emissivity, as determined by the details of anti-reflection coatings, etc. E. IONOSPHERIC INFRARED AND OPTICAL EMISSIONS Transmission of the microwave beam is expected to raise the electron temperature to a peak of at least 950 K throughout the D- and E-region of the ionosphere, causing a significant perturbation in the ambient conditions along the beam. Electron energy loss mechanisms will produce some enhancement of 6300A airglow emissions from 0( D) and 4.3-p and 6.5-p infrared emissions from
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