Hydroxyl (6−2) airglow emission intensity ratios for rotational temperature determination

Abstract. OH(6–2) Q1/P1 and R1/P1 airglow emission intensity ratios, for rotational states up to j' = 4.5, are measured to be lower than implied by transition probabilities published by various authors including Mies, Langhoff et al. and Turnbull and Lowe. Experimentally determined relative values of j' transitions yield OH(6–2) rotational temperatures 2 K lower than Langhoff et al., 7 K lower than Mies and 13 K lower than Turnbull and Lowe.Key words: Atmospheric composition and structure (airglow and aurora; pressure, density and temperature)

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Hydroxyl (6–2) airglow emission intensity ratios for rotational temperature determination

Annales Geophysicae ◽

10.1007/s005850000260 ◽

2000 ◽

Vol 18 (10) ◽

pp. 1293-1303

Author(s):

W. J. R. French ◽

G. B. Burns ◽

K. Finlayson ◽

P. A. Greet ◽

R. P. Lowe ◽

...

Keyword(s):

Emission Intensity ◽

Rotational Temperature ◽

Airglow Emission ◽

Temperature Determination ◽

Intensity Ratios

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Determining rotational temperatures from the OH(8-3) band, and a comparison with OH(6-2) rotational temperatures at Davis, Antarctica

Annales Geophysicae ◽

10.5194/angeo-22-1549-2004 ◽

2004 ◽

Vol 22 (5) ◽

pp. 1549-1561 ◽

Cited By ~ 12

Author(s):

F. Phillips ◽

G. B. Burns ◽

W. J. R. French ◽

P. F. B. Williams ◽

A. R. Klekociuk ◽

...

Keyword(s):

Key Words ◽

Water Vapour ◽

Line Intensity ◽

Transition Probabilities ◽

Atmospheric Composition ◽

Average Difference ◽

Solar Absorption ◽

Composition And Structure ◽

Water Vapour Absorption ◽

Intensity Ratios

Abstract. Rotational temperatures derived from the OH(8–3) band may vary by ~18K depending on the choice of transition probabilities. This is of concern when absolute temperatures or trends determined in combination with measurements of other hydroxyl bands are important. In this paper, measurements of the OH(8–3) temperature-insensitive Q/P and R/P line intensity ratios are used to select the most appropriate transition probabilities for use with this band. Aurora, airglow and solar and telluric absorption in the OH(8–3) band are also investigated. Water vapour absorption of P1(4), airglow or auroral contamination of P1(2) and solar absorption in the vicinity of P1(5) are concerns to be considered when deriving rotational temperatures from this band. A comparison is made of temperatures derived from OH(6–2) and OH(8–3) spectra collected alternately at Davis (69° S, 78° E) in 1990. An average difference of ~4K is found, with OH(8–3) temperatures being warmer, but a difference of this magnitude is within the two sigma uncertainty limit of the measurements. Key words. Atmospheric composition and structure airglow and aurora; pressure, density, and temperature)

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OH(6-2) spectra and rotational temperature measurements at Davis, Antarctica

Annales Geophysicae ◽

10.1007/s00585-997-0077-3 ◽

1998 ◽

Vol 16 (1) ◽

pp. 77-89 ◽

Cited By ~ 37

Author(s):

P. A. Greet ◽

W. J. R. French ◽

G. B. Burns ◽

P. F. B. Williams ◽

R. P. Lowe ◽

...

Keyword(s):

Middle Atmosphere ◽

Transition Probabilities ◽

Rotational Temperature ◽

Diurnal Variations ◽

Atmospheric Composition ◽

Data Set ◽

Average Temperature ◽

Composition And Structure ◽

Seasonal And Diurnal Variations ◽

Significant Contamination

Abstract. The OH(6-2) band was monitored during 1990 at Davis, Antarctica (68.6°S, 78.0°E) using a Czerny-Turner scanning spectrometer. Spectra obtained with a 0.15-nm bandwidth and wavelength steps of 0.005 nm have been recorded in an attempt to isolate auroral features. This has enabled detailed study of weak features in the region λ837.5–855.5 nm. These weak features can contribute to the apparent intensity of P-branch lines and to the background. Their presence is allowed for in our calculation of rotational temperature, but the P1(3) line is excluded because of significant contamination. An average temperature of 221±2 K is obtained from a selected data set of 104 spectra. The mid-winter average temperature, for the months of May, June and July, is 224±2 K, which is consistent with the 1986 CIRA model values for mid-winter at this height and latitude, but this result is dependent on the choice of transition probabilities. Preliminary assessments of seasonal and diurnal variations in rotational temperature and intensity are presented. Key words. Atmospheric composition and structure · Airglow and aurora; Middle-atmosphere composition and chemistry · Pressure · density and temperature

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On the fast movements of the thermosphere: an interpretation

Annales Geophysicae ◽

10.1007/s00585-001-1651-8 ◽

2000 ◽

Vol 18 (12) ◽

pp. 1651-1656

Author(s):

J. Lilensten ◽

P. O. Amblard

Keyword(s):

Rotation Velocity ◽

Atmospheric Composition ◽

Neutral Wind ◽

Typical Size ◽

F Region ◽

Optical Experiment ◽

Atmospheric Composition And Structure ◽

Composition And Structure ◽

Eiscat Radar

Abstract. We examine the oscillations of the meridional neutral wind in the F region as seen by the EISCAT radar. We propose an interpretation in term of eddies (tourbillons) of typical size of a few tens to a few hundreds of kilometers. The observed rotation velocity is a few hundreds of meters per second. We suggest that the tourbillons are a common feature of thermospheric movements. We propose an optical experiment to check the validity of this assumption.Key words: Atmospheric composition and structure (thermosphere · composition and chemistry) · Ionosphere (ionosphere · atmosphere interactions)

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Ultrafast Kelvin waves in the MLT airglow and wind, and their interaction with the atmospheric tides

Annales Geophysicae ◽

10.5194/angeo-36-231-2018 ◽

2018 ◽

Vol 36 (1) ◽

pp. 231-241 ◽

Cited By ~ 5

Author(s):

Fabio Egito ◽

Ricardo Arlen Buriti ◽

Amauri Fragoso Medeiros ◽

Hisao Takahashi

Keyword(s):

Middle Atmosphere ◽

Rotational Temperature ◽

Meridional Wind ◽

Equatorial Region ◽

Kelvin Waves ◽

Atmospheric Composition ◽

Atmospheric Tides ◽

Kelvin Wave ◽

Composition And Structure ◽

Integrated Intensities

Abstract. Airglow and wind measurements from the Brazilian equatorial region were used to investigate the presence and the effects of the 3–4-day ultrafast Kelvin waves in the MLT. The airglow integrated intensities of the OI557.7 nm, O2b(0-1) and OH(6-2) emissions, as well as the OH rotational temperature, were measured by a multichannel photometer, and the zonal and meridional wind components between 80 and 100 km were obtained from a meteor radar. Both instruments are installed in the Brazilian equatorial region at São João do Cariri (7.4∘ S, 36.5∘ W). Data from 2005 were used in this study. The 3–4-day oscillations appear intermittently throughout the year in the airglow. They were identified in January, March, July, August and October–November observations. The amplitudes induced by the waves in the airglow range from 26 to 40 % in the OI557.7 nm, 17 to 43 % in the O2b(0-1) and 15 to 20 % in the OH(6-2) emissions. In the OH rotational temperature, the amplitudes were from 4 to 6 K. Common 3–4-day oscillations between airglow and neutral wind compatible with ultrafast Kelvin waves were observed in March, August and October–November. In these cases, the amplitudes in the zonal wind were found to be between 22 and 28 m s−1 and the vertical wavelength ranges from 44 to 62 km. Evidence of the nonlinear interaction between the ultrafast Kelvin wave and diurnal tide was observed. Keywords. Atmospheric composition and structure (airglow and aurora) – meteorology and atmospheric dynamics (middle atmosphere dynamics; waves and tides)

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Atmospheric Composition and Structure

Encyclopedia of Geography ◽

10.4135/9781412939591.n64 ◽

2014 ◽

Keyword(s):

Atmospheric Composition ◽

Atmospheric Composition And Structure ◽

Composition And Structure

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The atmospheric composition and structure of Jupiter and Saturn from ISO observations: a preliminary review

Planetary and Space Science ◽

10.1016/s0032-0633(99)00046-x ◽

1999 ◽

Vol 47 (10-11) ◽

pp. 1225-1242 ◽

Cited By ~ 37

Author(s):

Th. Encrenaz ◽

P. Drossart ◽

H. Feuchtgruber ◽

E. Lellouch ◽

B. Bézard ◽

...

Keyword(s):

Atmospheric Composition ◽

Preliminary Review ◽

Atmospheric Composition And Structure ◽

Composition And Structure

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Atmospheric composition and structure of HD209458b

Proceedings of the International Astronomical Union ◽

10.1017/s1743921308027117 ◽

2008 ◽

Vol 4 (S253) ◽

pp. 524-527

Author(s):

J.-M. Désert ◽

A. Vidal-Madjar ◽

A. Lecavelier des Etangs ◽

D. Sing ◽

D. Ehrenreich ◽

...

Keyword(s):

Rayleigh Scattering ◽

Broad Band ◽

Temperature Inversion ◽

Upper Atmosphere ◽

Atmospheric Composition ◽

Transmission Spectra ◽

Transiting Planets ◽

Atmospheric Composition And Structure ◽

Composition And Structure ◽

Sodium Abundance

AbstractTransiting planets like HD209458b offer a unique opportunity to scrutinize their atmospheric composition and structure. Transit spectroscopy probes the transition region between the day and night sides, called the limb. We present a re-analysis of existing HST/STIS transmission spectra of HD209458b's atmosphere. From these observations we identify H2 Rayleigh scattering, derive the absolute Sodium abundance and quantify its depletion in the upper atmosphere, extract a stratospheric T-P profile and find a temperature inversion and explain broad band absorptions with the presence of TiO and VO molecules.

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<i>Letter to the Editor</i> Seasonal variations and vertical movement of the tropopause in the UTLS region

Annales Geophysicae ◽

10.5194/angeo-20-871-2002 ◽

2002 ◽

Vol 20 (6) ◽

pp. 871-874 ◽

Cited By ~ 3

Author(s):

K.-Y. Wang ◽

D. E. Shallcross ◽

J. A. Pyle

Keyword(s):

Seasonal Variations ◽

Vertical Movement ◽

Atmospheric Composition ◽

Upper Troposphere ◽

Spring Period ◽

Letter To The Editor ◽

Atmospheric Composition And Structure ◽

Composition And Structure ◽

Major Implication

Abstract. Based on the tracking of the movement of the tropopause over the whole year, the extent/depth of stratosphere-troposphere exchange (STE) events and their seasonal variations is investigated. It is found that a stratospheric signature can be observed at pressures as high as 400 hPa in a hemisphere during its winter to spring period, while a tropospheric signature can be observed at pressures as low as 190 hPa during the hemispheric summer to autumn months. The major implication for such a pronounced vertical movement is that the downward penetration of air from the stratosphere is likely to deposit elevated levels of O3 into the upper troposphere. Though the analysis at 250 hPa reveals that the values of the stratosphere-troposphere index are similar all year round, a result which is consistent with other studies, it is found that an intrusion from the stratosphere to the troposphere is more likely to occur during the hemispheric winter to spring period than other seasons.Key words. Atmospheric composition and structure (pressure, density, and temperature; troposphere–composition and chemistry)

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