A modelling investigation of sudden sodium layers

Details A modelling investigation of sudden sodium layers A modelling investigation of sudden sodium layers

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2841c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 24, p. 2841-2844

Physics

19

Atmospheric Models, Electron Attachment, Particle Diffusion, Sodium, Asymptotic Methods, Finite Difference Theory, Steady State, Temporal Resolution

Scientific paper

A time-resolved model, incorporating both vertical diffusion and chemistry, indicates that the minimum source strength required to produce a typical sudden sodium layer (SSL) is about 3 Na atoms/cu cm/s. However, many of the mechanisms proposed to explain the formation of SSLs are not able realistically to provide this source strength, or the source strength of about 1 Na atoms/cu cm/s that is required to maintain an SSL over several hours. Furthermore, the sodium reservoirs do not appear to contain sufficient sodium to produce an SSL, although sodium ions (Na(+)), and meteoric dust coated with sodium compounds, cannot be ruled out. An additional mechanism is proposed, namely, the release of atomic Na by dissociative electron attachment to sodium-containing silicate molecules (e.g. Na2SiO3 or NaAlSiO4) that are produced by meteoric ablation.

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