Variability of the mesospheric nightglow sodium D2/D1 ratio

  title={Variability of the mesospheric nightglow sodium D2/D1 ratio},
  author={T. Slanger and P. Cosby and D. Huestis and A. Saiz‐Lopez and B. Murray and D. O'Sullivan and J. Plane and C. Prieto and F. Mart{\'i}n-Torres and P. 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… Expand

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