Variability of the mesospheric nightglow sodium D2/D1 ratio

  title={Variability of the mesospheric nightglow sodium D2/D1 ratio},
  author={Tom G. Slanger and Philip Charles Cosby and David L. Huestis and Alfonso Saiz‐Lopez and Benjamin John Murray and Daniel O’Sullivan and John Maurice Campbell Plane and Carlos Allende Prieto and F. Javier Mart{\'i}n‐Torres and Peter Jenniskens},
  journal={Journal of Geophysical Research},
[1] Measurements of the intensity ratio of the 589.0/589.6 nm sodium doublet in the terrestrial nightglow over an 8-year period, involving >300 separate determinations, have established that it is variable, the value RD = I(D2)/I(D1) lying between 1.2 and 1.8. Sky spectra from the Keck I telescope with the High-Resolution Echelle Spectrometer (HIRES) echelle spectrograph and the Keck II telescope with the Echellette Spectrograph and Imager (ESI) echelle spectrograph were used in this analysis… 

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