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• W2160996883 abstract "We present case studies of the mesospheric alkali and non-alkali metals, Na and Fe, along with electron concentrations [Ne] obtained from measurements made at Arecibo on nights of 17–18 and 18–19 March 2004. The background mesospheric conditions as recorded by an airglow all-sky imager displayed ripple- and band-type structures on these nights. Both of the metals display detailed structures within their neutral sporadic layer but are more pronounced in Na than for Fe. A sporadic-E (Es) with electron concentrations [Ne] exceeding 3000 electrons cm−3 is accompanied by a strong Na enhancement and a weak sporadic Fe (Fes) layer around 95-km altitude. The concentration of Fe+ and Na+ is estimated to be close to 600 and 30 ions.cm−3, respectively, within the sporadic-E layer. In order to investigate ion-neutral coupling, a correlative analysis was performed in two altitude regions. Similar features are seen between neutrals and electrons in the 96–100-km altitude range, while within the altitude range of 80–90 km, an opposite behavior is seen. A comparative study between neutral layers below 90 km often referred to as the main or permanent layer and sporadic activity above 90 km reveals different characteristics for alkali and non-alkali metal. Fe concentrations in the main layer are higher than in Fes resulting in a density ratio of less than 1 determined from two layers of 3 km thickness centered at 97 and 87 km. For the case of Na, the ratio exceeds 1 during Es activity on both the nights. The case studies discussed in this work facilitate our understanding of different factors that can influence the sporadic activity in alkali and non-alkali metals. In a region dominated by ion-molecule chemistry, temperature fluctuations that can be induced by wave activity will have more impact on Na than for Fe within their layers depending on altitude." @default.
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• W2160996883 date "2015-09-11" @default.
• W2160996883 modified "2023-09-22" @default.
• W2160996883 title "Dependence of mesospheric Na and Fe distributions on electron density at Arecibo" @default.
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• W2160996883 doi "https://doi.org/10.1186/s40623-015-0322-z" @default.
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