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Article (Scientific journals)
The altitude distribution of the Venus ultraviolet nightglow and implications on vertical transport
Gérard, Jean-Claude; Stewart, A. I. F.; Bougher, Stephen W.
1981In Geophysical Research Letters, 8, p. 633-636
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Keywords :
NIGHTGLOW; VENUS; NITRIC OXIDE; THERMOSPHERE; TRANSPORT PROPERTIES; ULTRAVIOLET SPECTROSCOPY; VENUS ATMOSPHERE; DIFFUSION COEFFICIENT; PIONEER VENUS SPACECRAFT; SPACEBORNE ASTRONOMY; VERTICAL DISTRIBUTION; ALTITUDE; DISTRIBUTION; ULTRAVIOLET; WAVELENGTHS; VERTICAL TRANSPORT; SPECTROMETER; PIONEER VENUS; DATA; DATA REDUCTION; ANALYSIS; DIFFUSION; LAYERING; OBSERVATIONS; HYDRODYNAMICS; CARBON DIOXIDE
Abstract :
[en] The altitude distribution of the nitric oxide nightglow was measured with an ultraviolet spectrometer on board Pioneer Venus, in order to study the effects of the distribution on the Venus nightside lower thermosphere transport properties. Limb profiles were obtained with an 8 ms integration period on several orbits near periapsis. The observations were made between P minus 2 min and P plus 4 min, where altitude ranges between 150 and 350 km, and latitude varies from 24 degrees N to 9 degrees S. A method independent of the spacecraft attitude data was used to fit the observed limb profiles, and to find the altitude of the maximum of the layer (115 plus or minus 2 km), and the topside scale height (about 3 km). It is shown that downward transport by diffusion alone is not sufficient, and if vertical motion is parameterized by eddy diffusion, an eddy diffusion coefficient is deduced from the altitude of the layer.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Stewart, A. I. F.;  Colorado, University, Boulder, CO
Bougher, Stephen W.;  Michigan, University, Ann Arbor, MI
Language :
English
Title :
The altitude distribution of the Venus ultraviolet nightglow and implications on vertical transport
Publication date :
01 June 1981
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
American Geophysical Union, Washington, United States - District of Columbia
Volume :
8
Pages :
633-636
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
A&AA ID. AAA030.093.008
Available on ORBi :
since 31 October 2009

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