Calculations have been performed to determine the effect of reflected and scattered solar radiation on the photodetachment rate for O,-ions at a height of 65 km. The results are given for surfaces which reflect in accordance with Lambert's law, and for a smooth water surface which reflects in accordance with Fresnel's law. For Lambert surfaces, the detachment rate rises monotonically with increasing solar elevation angle and reaches a peak value when the sun is in the zenith. Upper and lower limits are given for various values of the reflection coefficient. For a reflection coefficient of 0.8 (thick cloud layer, or fresh snow cover), the upper limit on the noontime detachment rate is 1.1 see -x and the corresponding lower limit is 0.86 sec -• (clear day) or 0.74 sec -• (hazy day). For a reflection coefficient of 0.25 (desert sand), the upper limit is 0.69 sec -• and the lower limit is 0.57 sec -• (clear day) or 0.53 sec -• (hazy day). The detachment rate at 65 km above a smooth water surface, not including the effect of the reflected skylight, rises with increasing solar elevation angle to a peak value of 0.53 sec-L This value is attained approximately one hour and fifty minutes after sunrise at 65 km.
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Electron Beams Infrared Radiation Electron DepositionPlasma Radiation EXCEDE
ABSTRACT (Continue on reverse side if necessary and identify by block number)Further work, related to EXCEDE experiments, and to LWIR emission processes, is described. Efforts to account for the enhanced optical emission observed in the EXCEDE:SPECTRAL experiment on the basis of excitation by hot plasma electrons, using the independent particle deposition model, failed. The data appear consistent with a beam-plasma discharge mechanism. Analysis of ground-based photographic data imply that the region of enhancement extends for several hundred meters along 20. Abstract (continued) the earth's magnetic field. Study of plasma radiation from electron-beam irradiated air leads to the conclusion that EXCEDE is not the optimum tool for verifying our IR models for bound-bound recombination radiation.
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