Daytime Laser Radar Measurements of the Atmospheric Sodium Layer

  title={Daytime Laser Radar Measurements of the Atmospheric Sodium Layer},
  author={Abraham Gibson and M. C. W. Sandford},
IT is generally accepted that the column density (abundance) of atomic sodium in the layer at about 90 km altitude is enhanced during the day by a factor of 2 to 6 relative to that at twilight. The evidence for the enhancement is chiefly provided by ground-based observations of the sodium D line dayglow1–5, but there has been some discussion4–6 of the possibility that the ring effect (the partial filling of the Fraunhofer lines in scattered sunlight) may have affected the measurements… CONTINUE READING

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