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High resolution analysis of the sun's radiation received at the ground from 9 μ to 11.6 μ

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A brief report on the instrumentation for observations, at the ground, in the 9 μ to 11.6 μ spectral region, in the absorption of solar radiation through the terrestrial atmosphere and of the results thus obtained for the H2O, O3 and HNO3 molecules.

The observations have been made at Montlouis, in the south of France, at 1650 m above sea-level. Here the pollution of the atmosphere is very low because there is no industry and very little local domestic activity.

The chief aim ofM. Dionne [1], who is mainly responsible for this work, was to study the weak absorption of the terrestrial atmosphere around and beyond 10 μ, so observation had to be made with large air masses. For if there were excess water vapour the very weak lines might disappear through the background, owing to the water vapour itself; hence the need to observe during cold weather. Great air masses and cold weather can be obtained only on fine winter days, at about sunset. The configuration of Montlouis makes it difficult to observe at sunrise, so the time of observation was very limited.

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    J. Dionne,Spectre d'absorption atmosphérique de 9,1 μ à 11,6 μ, Thèse Université de Paris VI.

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    A. Girard, J. Phys. et Rad.24 (1963), 139;A. Girard, Appl. Optics2 (1963), 71;A. Girard,Etude d'un spectromètre à modulation sélective, Publications n0 117 (1967), O.N.E.R.A.

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    P. Vermande,Utilisation du spectromètre à grilles pour l'étude de l'atmosphère terrestre, J. de Physique29 (1968), 1041;P. Vermande,Application du spectromètre à grilles à l'étude de l'atmosphère terrestre, Thèse Juin 1970, Paris.

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    M. Migeotte, L. Neven andJ. Swenson, Le spectre solaire de 2,8 â 23,7μ.

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    S. A. Clough andF. X. Kneizys,Ozone absorption in the 9,0μ region, Phys. Sc. Res. Paper,170 (1965), Air Force Cambridge Research Laboratories.

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    D. G. Murcray, T. G. Kyle, F. H. Murcray andW. J. Williams,Presence of HNO 3 in the upper atmosphere, J. Opt. Soc. Am.59 (1969), 1131.

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    P. E. Rhine, L. D. Tubbs andD. Williams,Nitric acid vapor above 19 Km in the Earth's atmosphere, Applied Optics8 (1969), 1500.

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Additional information

Laboratoire de Physique Moléculaire et d'Optique Atmosphérique, Station de Montlouis.

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Vigroux, E. High resolution analysis of the sun's radiation received at the ground from 9 μ to 11.6 μ. PAGEOPH 106, 1336–1340 (1973). https://doi.org/10.1007/BF00881087

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  • Cold Weather
  • Rotation Band
  • Laboratory Spectrum
  • Terrestrial Atmosphere
  • High Resolution Analysis