NO infrared radiation in the upper atmosphere

Caledonia, G. E.; Kennealy, J. P.

doi:10.1016/0032-0633(82)90154-4

Cited by 56 publications

(28 citation statements)

References 52 publications

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“…We propose that there is a preference for the f•= 1/2 final state in the collisional excitation of NO(v=0) by O atoms, the main production channel for NO(v=l) in the thermosphere [Caledonia and Kennealy, 1982]. We can distinguish among these candidates on the basis of their relative aeronomic importance, as well as their consistency with the altitude dependence and lack of diurnal variation of the observed spin-orbit distributions.…”

Section: Origin Of Spin-orbit Nonequilibriummentioning

confidence: 99%

“…Above 100 [Caledonia and Kennealy, 1982]. Thus it is unlikely that either chemical production or earthshine pumping gives rise to a 50% effect (Figure 2(a)).…”

Section: Origin Of Spin-orbit Nonequilibriummentioning

confidence: 99%

“…N 2 and 02, are far less efficient relaxers[Caledonia and Kennealy, 1982]. N 2 and 02, are far less efficient relaxers[Caledonia and Kennealy, 1982].…”

mentioning

confidence: 96%

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Subthermal nitric oxide spin‐orbit distributions in the thermosphere

Lipson¹,

Armstrong²,

Dodd³

et al. 1994

Geophysical Research Letters

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The two NO(X²Π, υ=1, Ω=1/2,3/2) spin‐orbit populations in the Earth's thermosphere have been found to depart by more than a factor of 2 from the ratio expected from thermal equilibrium. The effective temperature describing the observed population distribution is as much as 700 K lower than the local kinetic temperature. Absolute NO(υ=1, J, Ω) column densities were derived from high‐resolution (1 cm−1) infrared earthlimb spectra for tangent altitudes up to 200 km, obtained in the CIRRIS 1A Space Shuttle experiment. Nonlinear least‐squares synthetic spectral fitting was used to analyze the NO Δυ=1 fundamental band emissions near 5.3 µm. The spin‐orbit distribution represents a third degree of freedom, along with vibration and rotation, that is not in equilibrium with the local kinetic temperature. These observations may significantly impact the interpretation of band‐integrated measurements of NO in the upper atmosphere, for which equilibrium sublevel distributions have been assumed. The subthermal distribution is most likely produced in the collisional uppumping of NO(υ=0) by O atoms, which is the major source of NO(υ=1) in the thermosphere. This inference suggests that the present effect is related to the subthermal spin‐orbit distributions observed in laboratory studies of NO2 photodissociation.

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Section: Origin Of Spin-orbit Nonequilibriummentioning

confidence: 99%

“…Above 100 [Caledonia and Kennealy, 1982]. Thus it is unlikely that either chemical production or earthshine pumping gives rise to a 50% effect (Figure 2(a)).…”

Section: Origin Of Spin-orbit Nonequilibriummentioning

confidence: 99%

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Subthermal nitric oxide spin‐orbit distributions in the thermosphere

Lipson¹,

Armstrong²,

Dodd³

et al. 1994

Geophysical Research Letters

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“…The flux of energy in this band is 15-30% of that for the fundamental band (13,35,58). In the presence of a strong parallel electric field, E l -lop4 -l o p 3 V/m, ionospheric electrons with temperatures of up to -4000K can efficiently excite the vibrational levels of N2 through N,-e collisions.…”

Section: 3-and 27-pm Emissions Of Nomentioning

confidence: 98%

Excitation of vibrational emission bands in aurora and airglow

Gordiet︠s︡¹

1986

Can. J. Phys.

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The major results of the theoretical study of infrared radiation in the vibrational-rotational bands of minor molecular constituents in the terrestrial thermosphere are reviewed. Various mechanisms of vibrational excitation of radiating molecules are discussed for both quiet and disturbed conditions (e.g., aurorally enhanced electric fields, etc.). Intensities of infrared emissions and correlations between some of them and emissions in other spectral regions are analyzed, as well as the role that infrared radiation plays in the thermospheric energetics.On revoit les principaux rtsultats de I'Ctude theorique du rayonnement infrarouge dans les bandes de vibration-rotation des constituants molCculaires mineurs dans la thermosphkre terrestre. On discute differents mecanismes d'excitation vibrationnelle des molCcules rayonnantes, dans des conditions paisibles ou perturbees (champs Clectriques intensifies par I'aurore, par exemple, etc ...). Les intensites des Cmissions infrarouges, ainsi que les corrClations entre certaines d'entre elks et les Cmissions dans d'autres regions spectrales sont analysCes, de m&me que le r61e jouC par le rayonnement infrarouge dans I'CnergCtique thermospherique.[Traduit par la revue]Can. J. Phys. 64. 1673 (1986)

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“…We suppose that the concentration of NO molecules on vibrational level v = 1 of the ground state X 2 P of nitric oxide [NO v = 1 ] is C(P/a eff ) 1/2 , where P is the ionisation rate, a eff is the effective coefficient of recombination in the ionospheric D-region, C = 1.3 (Caledonia and Kennealy, 1982). The vibrationally excited nitric oxide loses energy Fig.…”

Section: The Modelmentioning

confidence: 99%