Laboratory studies and modelling of mesospheric iron chemistry

Details Laboratory studies and modelling of mesospheric iron chemistry Laboratory studies and modelling of mesospheric iron chemistry

Publishing date

Sep 2003

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003adspr..32..699p&link_type=abstract

Journals

Advances in Space Research, Volume 32, Issue 5, p. 699-708.

Science

Physics

Additional info 2

14

Type

Scientific paper

Abstract

Both neutral and ionized iron species occur in the mesosphere and lower thermosphere as a result of meteoric ablation. This paper examines two phenomena that are of current interest: the formation of sporadic neutral Fe layers from sporadic E layers; and the chemical amplification that can occur when the atomic Fe layer is perturbed by atmospheric gravity waves. Understanding these processes requires the development of a detailed chemical model, where the rate coefficients of the individual reactions have been measured in the laboratory. A novel experimental system for studying the reactions of Fe-containing species is described. Pulses of atomic Fe and Fe+ were produced in the upstream section of a fast flow tube by the pulsed laser ablation of a pure Fe rod, and detected at the downstream end by laser induced fluorescence and mass spectrometry, respectively. This apparatus was used to study the reactions of neutral and ionic Fe-containing molecules with atomic O and H. These reactions influence the appearance of the Fe layer by governing the rates at which iron is converted from reservoir species (e.g. FeOH, Fe+) back to Fe. The new model of the Fe layer that results from this experimental work is then used to show that sporadic Fe layers can form from descending sporadic E layers, and that the Fe layer should exhibit significant chemical amplification below 90 km when perturbed by gravity waves.

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