Long-period wave signatures in mesospheric OH Meinel (6,2) band intensity and rotational temperature at mid-latitudes

Taylor, Michael J.; Gardner, L. C.; Pendleton, W. R.

doi:10.1016/s0273-1177(01)00153-3

Cited by 37 publications

(35 citation statements)

References 26 publications

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“…The best-fit result shows that 8.6±0.1-h and 8.8±0.3-h waves with amplitude 10.5±0.4 K and 10.9±0.7 K are present in the OH and O 2 temperature data, respectively (small differences in values with earlier reported periodicities and amplitudes by Taori et al (2005) are the result of different methods adopted for As mentioned above, the deduced Krassovsky parameters, show large differences from one night to other, indicating a high degree of dynamical variability at mesospheric altitudes during July 2002 over Hawaii. Figure 3 shows a comparison of our results for η and with those of earlier reports, taking the average arithmetic value with respect to periodicity, which ranges from 6-to 12-h waves (Viereck and Deehr, 1989;Takahashi et al, 1992;Oznovich et al, 1995Oznovich et al, , 1997Drob, 1996;Reisin and Scheer, 1996;Taylor et al, 2001;Lopez-Gonzalez et al, 2005), and model estimates of Schubert et al (1991), Tarasick and Shepherd (1992a, b), Walterscheid and Schubert (1995), and Hickey et al (1993). It is evident that the observed η and ϕ values in our study show a large spread in their distribution as compared to the model values.…”

Section: Resultsmentioning

confidence: 79%

Summer-time nocturnal wave characteristics in mesospheric OH and O2 airglow emissions

2008

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The mesospheric temperature mapper (MTM) measurements on mesospheric OH (6, 2) and O 2 (0, 1) band emissions from Maui, Hawaii during July, 2002 show significant day-to-day variability. The nocturnal variability reveals prominent wave signatures with a periodicity ranging from 6 to 13 h. For better characterization of the nocturnal wave in the data, a Krassovsky's η (∼|η|e iϕ ) analysis was carried out. Deduced Krassovsky parameters show significant variability, with ranges of |η| ∼ 1.7-3.9 for the OH data and ∼4.3-13 for the O 2 data. The phase values of Krassovsky parameters exhibit larger variability, with variations from approximately −91• to +23• for the OH data and −45• to −10 • for the O 2 data. Comparison of these values with existing observations and models show large deviations from model values and relatively better agreements with the observed values reported by other investigators. The deduced vertical wavelength from |η| and ϕ indicates that our data is mostly dominated by upward propagating waves with occasional high values ≥100 km, implying possible evanescent waves.

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Section: Resultsmentioning

confidence: 79%

Summer-time nocturnal wave characteristics in mesospheric OH and O2 airglow emissions

2008

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“…The high quantum efficiency (∼50% at near-infrared wavelengths) and low noise characteristics (dark current ∼0.1 e − /pixel/s at −50 • C) of the CCD array provide an exceptional capability of high quality nocturnal measurements of OH and O 2 emission intensity (<0.5% in 1 min) and derived rotational temperatures (precision <1-2 K in 3 min). The details of this instrument are discussed elsewhere (Pendleton et al, 2000;Taylor et al, 2001). …”

Section: Instrument and Observationsmentioning

confidence: 99%

On the use of simultaneous measurements of OH and O<sub>2</sub> emissions to investigate wave growth and dissipation

2007

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Abstract. Simultaneous measurements of mesospheric OH (6-2) Meinel and O 2 (0-1) Atmospheric band emissions from a low-latitude station, Maui, Hawaii (20.8 • N, 156.2 • W) are utilized to study the wave characteristics and associated processes. Deduced temperatures show large variability in both OH and O 2 data. The seasonal variability in the temperature shows a well-defined, semiannual type of oscillation, which are comparable to the ground-based rocket sounding data. The "Wave Growth Factor", a ratio of normalized perturbation amplitude in O 2 to the OH temperature variability, is estimated for principal as well as residual smaller period components of the nocturnal variability. It is noticed that smaller period waves (less than 12 h) occasionally have large growth factors of about 3-4 during equinox transitions, an indication of wave amplitude amplification within the 87-94 km altitudes while a strong wavedissipation occurs throughout the year.Keywords. Ionosphere (Equatorial ionosphere) -Atmospheric composition and structure (Airglow and aurora) -Meteorology and atmospheric dynamics (Middle atmosphere dynamics)

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“…Although the middle atmosphere wind filtering would block some of the upward propagation of AGWs, some fast propagating AGWs can reach the mesosphere and lower thermosphere (MLT) region. To conserve the wave energy, the amplitude of the AGWs becomes large and leads to wave saturation and breaking, influencing the balance of dynamics and thermodynamics in the MLT (Vincent, 1984;Taylor et al, 2001;Fritts and Alexander, 2003, and references therein). Therefore, AGWs play an important role in momentum and energy transports, thus controlling the global-scale circulation in the MLT region (Houghton, 1978;Lindzen, 1981;Holton, 1982).…”

Section: Introductionmentioning

confidence: 99%

Statistical characteristics of gravity wave activities observed by an OH airglow imager at Xinglong, in northern China

Yue

et al. 2011

Ann. Geophys.

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Abstract. An all-sky airglow imager (ASAI) was installed at Xinglong, in northern China (40.2 • N, 117.4 • E) in November 2009 to study the morphology of atmospheric gravity waves (AGWs) in the mesosphere and lower thermosphere (MLT) region. Using one year of OH airglow imager data from December 2009 to November 2010, the characteristics of short-period AGWs are investigated and a yearlong AGW climatology in northern China is first ever reported. AGW occurrence frequency in summer and winter is higher than that in equinoctial months. Observed bands mainly have horizontal wavelengths from 10 to 35 km, observed periods from 4 to 14 min and observed horizontal phase speeds in the range of 30 to 60 m s −1 . Most of the bands propagate in the meridional direction. The propagation directions of the bands show a strong southwestward preference in winter, while almost all bands propagate northeastward in summer. Although the wind filtering in the middle atmosphere may control AGW propagations in the zonal direction, the nonuniform distribution of wave sources in the lower atmosphere may contribute to the anisotropy in the meridional direction in different seasons. Additionally, as an indication of local instability, the characteristics of ripples are also analyzed. It also shows seasonal variations, occurring more often in summer and winter and mainly moving westward in summer and eastward in winter.

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Long-period wave signatures in mesospheric OH Meinel (6,2) band intensity and rotational temperature at mid-latitudes

Cited by 37 publications

References 26 publications

Summer-time nocturnal wave characteristics in mesospheric OH and O2 airglow emissions

Summer-time nocturnal wave characteristics in mesospheric OH and O2 airglow emissions

On the use of simultaneous measurements of OH and O<sub>2</sub> emissions to investigate wave growth and dissipation

Statistical characteristics of gravity wave activities observed by an OH airglow imager at Xinglong, in northern China

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Long-period wave signatures in mesospheric OH Meinel (6,2) band intensity and rotational temperature at mid-latitudes

Cited by 37 publications

References 26 publications

Summer-time nocturnal wave characteristics in mesospheric OH and O2 airglow emissions

Summer-time nocturnal wave characteristics in mesospheric OH and O2 airglow emissions

On the use of simultaneous measurements of OH and O&lt;sub&gt;2&lt;/sub&gt; emissions to investigate wave growth and dissipation

Statistical characteristics of gravity wave activities observed by an OH airglow imager at Xinglong, in northern China

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On the use of simultaneous measurements of OH and O<sub>2</sub> emissions to investigate wave growth and dissipation