Distribution in the Upper Atmosphere of Sodium Atoms Excited by Sunlight
1956; American Institute of Physics; Volume: 104; Issue: 4 Linguagem: Inglês
10.1103/physrev.104.873
ISSN1536-6065
AutoresT. M. Donahue, Robert Resnick, V. Robert Stull,
Tópico(s)Atmospheric Ozone and Climate
ResumoCalculation is made of the distribution of atoms excited to the $^{2}P_{\frac{3}{2}}$ state by solar radiation, direct and reflected from the earth for a model sodium layer between 70 and 100 km. Account is taken of the attenuation by resonance absorption of sunlight in the layer before the solar photons reach a given point in the layer. This absorption grossly modifies the scattered intensity at twilight, causing minima to appear at about 5\ifmmode^\circ\else\textdegree\fi{} solar depression and reducing greatly the difference in scattering for thicknesses between 2\ifmmode\times\else\texttimes\fi{}${10}^{9}$ ${\mathrm{cm}}^{\ensuremath{-}2}$ and 2\ifmmode\times\else\texttimes\fi{}${10}^{11}$ atoms/${\mathrm{cm}}^{2}$ in late twilight. The effect of imprisonment, not included, is expected to modify only the late twilight results.
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