Spectroscopic observations of bright and dark emission features on the night side of Venus

James Bell, D. Crisp, P. G. Lucey, T. A. Ozoroski, W. M. Sinton, S. C. Willis, B. A. Campbell

Research output: Contribution to journalArticle

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Abstract

Near-infrared spectra of a bright and a dark thermal emission feature on the night side of Venus have been obtained from 2.2 to 2.5 micrometers (μm) at a spectral resolution of 1200 to 1500. Both bright and dark features show numerous weak absorption bands produced by CO2, CO, water vapor, and other gases. The bright feature (hot spot) emits more radiation than the dark feature (cold spot) throughout this spectral region, but the largest contrasts occur between 2.21 and 2.32 μm, where H2SO4 clouds and a weak CO2 band provide the only known sources of extinction. The contrast decreases by 55 to 65 percent at wavelengths longer than 2.34 μm, where CO, clouds, and water vapor also absorb and scatter upwelling radiation. This contrast reduction may provide direct spectroscopic evidence for horizontal variations in the water vapor concentrations in the Venus atmosphere at levels below the cloud tops.

Original languageEnglish (US)
Pages (from-to)1293-1296
Number of pages4
JournalScience
Volume252
Issue number5010
StatePublished - May 31 1991
Externally publishedYes

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Venus
Steam
Carbon Monoxide
Radiation
Atmosphere
Hot Temperature
Gases

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Cite this

Bell, J., Crisp, D., Lucey, P. G., Ozoroski, T. A., Sinton, W. M., Willis, S. C., & Campbell, B. A. (1991). Spectroscopic observations of bright and dark emission features on the night side of Venus. Science, 252(5010), 1293-1296.

Spectroscopic observations of bright and dark emission features on the night side of Venus. / Bell, James; Crisp, D.; Lucey, P. G.; Ozoroski, T. A.; Sinton, W. M.; Willis, S. C.; Campbell, B. A.

In: Science, Vol. 252, No. 5010, 31.05.1991, p. 1293-1296.

Research output: Contribution to journalArticle

Bell, J, Crisp, D, Lucey, PG, Ozoroski, TA, Sinton, WM, Willis, SC & Campbell, BA 1991, 'Spectroscopic observations of bright and dark emission features on the night side of Venus', Science, vol. 252, no. 5010, pp. 1293-1296.
Bell J, Crisp D, Lucey PG, Ozoroski TA, Sinton WM, Willis SC et al. Spectroscopic observations of bright and dark emission features on the night side of Venus. Science. 1991 May 31;252(5010):1293-1296.
Bell, James ; Crisp, D. ; Lucey, P. G. ; Ozoroski, T. A. ; Sinton, W. M. ; Willis, S. C. ; Campbell, B. A. / Spectroscopic observations of bright and dark emission features on the night side of Venus. In: Science. 1991 ; Vol. 252, No. 5010. pp. 1293-1296.
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