Oscillations of intensity and temperature of nightglow emissions: [01] 557.7 nm and 630.0 nm lines, and OH(6-2) band

Misawa, K.; Takeuchi, Tsuyoshi

doi:10.1016/0021-9169(81)90067-2

Cited by 6 publications

(2 citation statements)

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“…Temporal fluctuations in the emission intensity and rotational temperature of the hydroxyl nightglow are generally attributed to the propagation of internal gravity waves through the mesopause region [Krassovsky, 1972' Krassovsky and Shagaev, 1974a, b, 1977' Krassovsky et al, 1975' Krassovsky and Shefor, 1976' Noxon, 1978' Tepley et al, 1981' Misawa and Takeuchi, 1981' Myrabo et al, 1983' Hamwey, 1985. Photographs of the OH emission that display wavelike structures support the internal gravity wave attribution and provide information on the horizontal scale of the waves [Peterson and Kieffaber, 1973' Crawford et al, 1975' Moreels and Hers•, 1977' Peterson, 1979, Hers• et al, 1980' Hers•, 1984.…”

Section: Introductionmentioning

confidence: 99%

A dynamical‐chemical model of wave‐driven fluctuations in the OH nightglow

Walterscheid¹,

Schubert²,

Straus³

1987

J. Geophys. Res.

121

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Wave-induced temporal fluctuations in the intensity of the OH nightglow are related to the temperature oscillations of the wave field by a model that incorporates a five-reaction photochemical scheme and the complete dynamics of linearized acoustic-gravity waves in an isothermal, motionless atmosphere. The intensity I and rotational temperature T oscillations, 61 and 6T, are conveniently related by the ratio •/= (6I/I-)/(6T/•, where the overbar refers to time-averaged quantities. The ratio •/ is a complex quantity that depends on the properties of the basic state atmosphere (temperature, thermodynamic parameters, major constituent 0 2, N 2 and minor constituent O, 0 3, OH, H, HO 2 concentrations, and scale heights), chemical reaction rate constants, wave period, horizontal wavelength, and direction of wave energy propagation (upward or downward). The intensity-temperature oscillation ratio r/is evaluated for a nominal case corresponding to an altitude of about 83 km in a nightside model atmosphere with an atomic oxygen scale height of -2.8 km; horizontal wavelength 2,, is 100 km, and wave energy propagation is upward. Over a broad range of acoustic periods [r/I varies between 7 and 8, and r/ is approximately in phase with the temperature fluctuations. At gravity wave periods, I•l decreases with increasing period from a maximum value of about 7.0; at a period of about 3 hours, I,/I is about 1.8. The phase of r/ and 6T are within 45 ø in the gravity wave regime. The main effect of order of magnitude changes in 2,, is the modification of the location and width (in period) of evanescent regions. At hour periods, I•l increases as the magnitude of atomic oxygen scale height decreases' at periods of several hours, I•/[ is about 1/3 greater for an atomic oxygen scale height of -2 km than for the nominal scale height. The amplitude Qf r/is essentially independent of the direction of wave energy propagation, but the phase of •1 relative to that of 6T depends on the upward or downward sense of energy propagation at periods in close proximity to the evanescent regime. The magnitude of r/ at gravity wave periods can depend sensitively on the altitude of the OH emission layer' higher OH emission heights give smaller values of I•l at 10-min periods, providing the 0 3 scale height is not too great. Neglect of minor constituent photochemistry in computing r/is a tolerable approximation at acoustic wave periods, but it is entirely inadequate at gravity wave periods. Inclusion of dynamical effects is absolutely essential for a valid assessment of r/at any period. Observations of the wave-induced oscillations in the intensity c5I and temperature cST of the OH nightglow can be combined with a theory relating c5I and cST to infer both the concentrations and scale heights of the major and minor species involved in OH mesopause photochemistry and the periods and horizontal wavelengths of the disturbing waves. o However, relatively little has been done along these lines despite the availability of relevant data, perhaps because of theore...

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Section: Introductionmentioning

confidence: 99%

A dynamical‐chemical model of wave‐driven fluctuations in the OH nightglow

Walterscheid¹,

Schubert²,

Straus³

1987

J. Geophys. Res.

121

View full text Add to dashboard Cite

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“…Temporal fluctuations in the emission intensity and rotational temperature of the hydroxyl nightglow occur over a broad range of time scales. At periods of minutes to hours the fluctuations are generally attributed to the propagation of accoustic-gravity waves through the mesopause region [Krassovsky, 1972;Krassovsky andShagaev, 1974a, b, 1977;Krassovsky et al, 1975Krassovsky and Shefov, 1976;Noxon, 1978;Tepley et al, 1981;Misawa and Takeuchi, 1981;Myrabo et al, 1983;Hamwey, 1985]. There are also fluctuations at hourly to semidiurnal periods that are undoubtedly related to upward propagating atmospheric tides [Takahashi et al, 1984[Takahashi et al, , 1986.…”

Section: Introductionmentioning

confidence: 99%

A dynamical‐chemical model of tidally driven fluctuations in the OH nightglow

Walterscheid¹,

Schubert²

1987

J. Geophys. Res.

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A theory is presented to explain tidally induced oscillations in the emission intensity I and rotational temperature T of the OH nightglow. The theory includes photochemical reactions among H, O, O 3, OH, and HO 2 and the complete dynamics of tides in an isothermal, uniformly rotating atmosphere. The ratio rl = (6I/[)/(6T/T) (6 refers to a perturbation quantity and the overbar signifies an average) depends on basic state atmospheric structure, minor constituent scale heights, especially that of O, and altitude of OH emission. For both semidiurnal and diurnal migrating modes, r/ has an amplitude in the approximate range 1-2.5 and a phase between about 10 ø and 30 ø.

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