A proposed temperature dependent mechanism for the formation of sporadic sodium layers

Details A proposed temperature dependent mechanism for the formation of sporadic sodium layers A proposed temperature dependent mechanism for the formation of sporadic sodium layers

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55..513z&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 3, p. 513-521.

Physics

20

Atmospheric Ionization, Gravity Waves, Ionospheric Ion Density, Sodium Vapor, Temperature Effects, Atmospheric Tides, Electron Density (Concentration), Mesopause, Periodic Variations, Sporadic E Layer

Scientific paper

We examine the influence of temperature fluctuations on the formation of sporadic sodium layers (SSLs) with particular emphasis on Arecibo Initiative in the Dynamics of the Atmosphere results. We present evidence suggesting that sodium abundance is very sensitive to the temperature. Thus the sodium profile may change significantly if appropriate thermal fluctuations due to tides and/or acoustic-gravity waves (AGWs) occur. Gravity wave theory predicts that the ion convergence node, without other influences, coincides with a temperature maximum for a westward propagating wave. In this case, the ion layer coincides with the temperature maximum which results in a higher sodium concentration at or near the ion layer height. This proposed temperature dependency can, for the tidal wind field, account for the observed correlation between sodium and ion column abundances and is supported by the average O2(0-1) rotational temperature determinations made at Arecibo. Specifically, we propose that the formation of SSLs is due to the temperature fluctuations induced by AGWs, or other wave processes, in conjunction with a background tidal wind system.

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