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A calculation of the resonance scattering from a sodium layer between 70 and 100 km for all daylight angles of solar depression is presented. Observations at zenith distance zero and in a plane perpendicular to the sun are considered. The calculation is based on a previous computation of the density of sodium excited by the sun. The effect of absorption in the sodium layer is taken into account. The intensity rises by a factor of about 5 from sunset to noon for a layer 2×1011 cm−2 thick and by about 27 for a layer only 2×109 cm−2 thick.
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T. M. Donahue (1956) studied this question.
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