1984 .

(2 publications)

M.-P. Lemaitre, J. Laurent, J. Besson, A. Girard, C. Lippens, C. Muller, J. Vercheval, and M. Ackerman. Sample Performance of the Grille Spectrometer. Science, 225:171-172, July 1984. [ bib | DOI | ADS link ]

The grille spectrometer observed the setting and rising sun 18 times during the Spacelab 1 mission. In addition to solar absorption lines, many of which had not been observed before, atmospheric spectral absorptions due to carbon monoxide and carbon dioxide were observed at heights tangent to the thermosphere (greater than 85 kilometers), and absorptions due to ozone, water, methane, and nitrous oxide were observed in the mesosphere (greater than 50 kilometers). The strongly coupled molecules NO-NO2 and HCl-HF were observed as pairs in the stratosphere. Methane is presented as an example of the instrumental operations because of the characteristic aspect of the Q branch of its v3 band.

C. Lippens, C. Muller, J. Vercheval, M. Ackermann, J. Laurent, M. P. Lemaitre, J. Besson, and A. Girard. Trace constituents measurements deduced from spectrometric observations on-board Spacelab. Advances in Space Research, 4:75-79, 1984. [ bib | DOI | ADS link ]

Spectrometric measurements of carbon dioxide, carbon monoxide, and water vapor content in the middle atmosphere, obtained during the Spacelab mission, are examined. The carbon dioxide volume mixing ratio obtained follows closely the 0.0003 value up to a 100-km altitude, and drops abruptly at higher altitudes by a factor of 10 (at 115 km). The results of two absorption runs for carbon monoxide indicate a P(6) line at sunset in the Northern Hemisphere. Finally, the water vapor content studies in the spectral region of 6.3 and 2.7 microns suggest a tendency for the water vapor mixing ratio abundance to increase with the altitude increasing from 30 to 50 km and to decrease from 72 to 80 km.