Global variation in the 2.7 µm NO overtone limb‐emission from the lower thermosphere

Sharma, Renuka; Wheeler, N. B.; Wise, J. O.; Dothe, H.; Duff, J. W.

doi:10.1029/1999gl010925

Cited by 8 publications

(9 citation statements)

References 15 publications

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“…The 2.7 µm overtone emission corresponding to Δ v = 2 is produced only from the higher vibrational levels ( v ≥ 2) of NO. As the vibrational levels in NO are separated by approximately 0.23 eV, excitation of the v ≥ 2 levels via inelastic collisions with atomic oxygen is unlikely to occur in the thermosphere, and solar pumping of NO( v = 0) to NO( v = 2) has been found to be a negligible source of excitation [ Sharma et al ., ]. It can then be assumed that the higher vibrational levels are initially populated only by means of chemical processes, and the overtone emission is purely chemical in origin.…”

Section: Resultsmentioning

confidence: 99%

Contribution of chemical processes to infrared emissions from nitric oxide in the thermosphere

Venkataramani¹,

Yonker²,

Bailey³

2016

JGR Space Physics

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Infrared emissions from nitric oxide (NO) are the dominant source of radiative cooling between 120 and 200 km and play an important role in determining the energy budget of the Earth's upper atmosphere. The emission arises as a consequence of producing vibrationally excited NO, either by collisions with energetic atomic oxygen or via the reaction of atomic nitrogen with molecular oxygen. The latter process is a potentially important source of cooling, as it can excite the higher vibrational levels (v ≥ 2) of nitric oxide, resulting in the emission of multiple photons. This chemiluminescent emission has been modeled by calculating the level populations of NO(v ≤ 10) considering production from the reaction of N(2D) and N(4S) with O2, along with interlevel cascade due to radiative deexcitation and collisional quenching. We integrate this model into the NCAR TIE‐GCM (Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model) to calculate the contribution of chemiluminescence to infrared emissions from NO in the thermosphere. For day 80 of 2003, it is shown that chemiluminescence accounts for 15–30% of the total column emissions from NO in the sunlit thermosphere between ±50° latitude. More than 60% of the chemiluminescence is produced from v ≥ 3, indicating that these vibrational levels are an important source of thermospheric cooling. Model calculations of the first overtone emission (Δv = 2) are shown to be in agreement with measurements by the Cryogenic Infrared Radiance Instrumentation for Shuttle (CIRRIS‐1A) experiment. A computationally inexpensive parameterization which calculates the chemiluminescence from v ≤ 10 within 5% of the full calculation is also presented.

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Section: Resultsmentioning

confidence: 99%

Contribution of chemical processes to infrared emissions from nitric oxide in the thermosphere

Venkataramani¹,

Yonker²,

Bailey³

2016

JGR Space Physics

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“…This happens because the semiclassical approach tends to overestimate the v = 0 probability, since every trajectory ending with vibrational energy lower than ZPE contributes only for such an inelastic collision. The probability of obtaining higher vibrational states decreases very fast, and collisions between O + NO(v = 0) are known to have negligible contribution [41] to the population of NO(v = 2) in the thermosphere, if compared to the major sources of it, namely N( 4 S, 2 D) + O 2 . For T = 750 K, the semiclassical approach does not assign a single trajectory to v ≥ 3.…”

Section: Resultsmentioning

confidence: 98%

Quasiclassical trajectory study of the rotational distribution for the O+NO(v = 0) fundamental vibrational excitation

Galvão

Corzo-Espinoza²,

Caridade

et al. 2011

Int J of Chemical Kinetics

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Quasiclassical trajectories have been run to study the fundamental one-quantum vibrational transition formed from collisions of ground-state nitric oxide with atomic oxygen at temperatures of 500, 750, and 1000 K. Two adiabatic potential energy surfaces of different symmetry ( 2 A and 2 A of NO 2 ) have been utilized. The rate constant for the title process is given along with the rotational distributions, and the results shown to corroborate previous atmospheric models that describe the nascent state by a Maxwell-Boltzmann distribution at the local temperature. C

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“…The 5.3 μm fundamental vibration‐rotation band (Δν = −1; Δj = 0, ±1) emission from NO is the strongest cooling agent in the 110–300 km region of the terrestrial thermosphere [ Kockarts , 1980; Zachor et al , 1985; Sharma et al , 1998; Sharma and Roble , 2001]. The 5.3 μm emission from the fundamental band as well as that from the overtone band (Δν = −2; Δj = 0, ±1) of NO around 2.7 μm are both greatly enhanced during an auroral event [ Sharma et al , 2000, 2001]. This is dramatically illustrated by the global images of 5.3 μm emission from NO taken by SABER (Sounding of the Atmosphere using Broadband Emission Radiometery) instrument aboard NASA's TIMED (Thermosphere‐Ionosphere‐Mesosphere Energetics and Dynamics) satellite on the 15 and 19 April 2002, before and after solar coronal mass ejection events, respectively [ Russell et al , 2002].…”

Section: Introductionmentioning

confidence: 99%

A first‐principles model of spectrally resolved 5.3 μm nitric oxide emission from aurorally dosed nighttime high‐altitude terrestrial thermosphere

Duff

Dothe

Sharma

2005

Geophysical Research Letters

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[1] The spectrally resolved nighttime 5.3 mm emission from NO observed by the Cryogenic Infrared Radiance Instrumentation for Shuttle (CIRRIS-1A) experiment aboard space shuttle Discovery at 195 km tangent altitude during a strong auroral event is modeled using a firstprinciples kinetics model. An appropriate SHARC (Strategic High Altitude Radiance Code) Atmospheric Generator (SAG) is dosed with an IBC class III aurora. The spectrally resolved fundamental vibration-rotation band emissions from NO around 5.3 mm resulting from impacts of ambient NO with O as well as reactions of N atoms with O 2 are calculated under steady state conditions. The calculated results, using a local translational temperature derived from the observed spectrum, are in excellent agreement with the CIRRIS-1A observations, validating our model. The importance of the accurate nascent vibrational and rotational distribution of chemically produced NO as well as the collisonally induced rotationto-vibration relaxation of rotationally hot NO is pointed out.Citation: Duff, J. W., H. Dothe, and R. D. Sharma (2005), A first-principles model of spectrally resolved 5.3 mm nitric oxide emission from aurorally dosed nighttime high-altitude terrestrial thermosphere, Geophys. Res. Lett., 32, L17108,

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Global variation in the 2.7 µm NO overtone limb‐emission from the lower thermosphere

Cited by 8 publications

References 15 publications

Contribution of chemical processes to infrared emissions from nitric oxide in the thermosphere

Contribution of chemical processes to infrared emissions from nitric oxide in the thermosphere

Quasiclassical trajectory study of the rotational distribution for the O+NO(v = 0) fundamental vibrational excitation

A first‐principles model of spectrally resolved 5.3 μm nitric oxide emission from aurorally dosed nighttime high‐altitude terrestrial thermosphere

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