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Thermospheric nitric oxide and its role in thermospheric dynamics and composition
Gérard, Jean-Claude; Roble, R. G.
1986In Thermosphere Dynamics Workshop II
 

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Keywords :
ATMOSPHERIC CIRCULATION; ATMOSPHERIC COMPOSITION; ATMOSPHERIC CONDUCTIVITY; NITRIC OXIDE; THERMOSPHERE; ATMOSPHERIC TEMPERATURE; COOLING; EXPLORER SATELLITES; MERIDIONAL FLOW; TEMPERATURE GRADIENTS; THERMODYNAMICS
Abstract :
[en] The global distribution of thermospheric nitric oxide has been measured under different geophysical conditions by the Atmosphere Explorer (AE) and Solar Mesosphere Explorer (SME) satellites. These observations show a great variability in the NO concentration but the existence of a latitudinal gradient is clearly evidenced by statistical maps of the NO meridional distribution. A two dimensional zonally averaged chemical-dynamical model was used to investigate the importance of nitric oxide 5.3 micrometer cooling and its role on thermospheric temperature, dynamics and major gas composition. For this purpose, a 2-D background atmosphere code and an odd nitrogen code were coupled and run to steady state. The NO distribution obtained is in good agreement with the AE-D global picture calculated at solstice for solar minimum activity. The importance of each term in the thermodynamic equation was studied spatially. It is found that the NO I.R. cooling term competes with conduction in the upper thermosphere and reaches its maximum value near 200 km at high summer latitudes. The primary effect of including the NO cooling term is to increase the temperature in the upper winter thermosphere and decrease it in the other hemisphere, if the global average temperature is fixed. In general, the strength of the circulation is decreased and the thermal gradient is smoother. As a consequence of these changes in the wind and temperature fields, the O2, N2 and O densities also react to the effect of the NO cooling. The importance of this process depends on the level of solar activity which controls the NO distribution.
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)
Roble, R. G.;  National Center for Atmospheric Research, Boulder, Colo.
Language :
English
Title :
Thermospheric nitric oxide and its role in thermospheric dynamics and composition
Publication date :
01 June 1986
Main work title :
Thermosphere Dynamics Workshop II
Publisher :
NASA
Pages :
105-117
Available on ORBi :
since 22 December 2009

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