Observation of Atmospheric Sodium in Absorption

Details Observation of Atmospheric Sodium in Absorption Observation of Atmospheric Sodium in Absorption

Oct 1956

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1956natur.178..753s&link_type=abstract

Nature, Volume 178, Issue 4536, pp. 753-754 (1956).

Physics

Scientific paper

NEARLY twenty years ago, the presence of sodium in the upper atmosphere was found by the observation of the D lines in twilight1. Attempts to deduce the amount of sodium in the layer suffer from an unknown correction for self-absorption2. It is therefore of interest to try to observe the sodium by its absorption; but this is difficult with sunlight because of the strong Fraunhöfer lines originating in the Sun itself. An attempt was made by Sanford3 using the star α Virginis as a source; here the stellar and interstellar D lines are shifted by the Doppler effect so that they do not interfere. He found a faint line which may have been telluric D1, and deduced a corresponding upper limit of 1.0 × 1010 atoms/cm.2 for the `thickness' of the layer, as we may call it.

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