WINDII/UARS observation of twilight behaviour of the hydroxyl airglow, at mid-latitude equinox

1996 ◽  
Vol 58 (16) ◽  
pp. 1863-1869 ◽  
Author(s):  
R.P. Lowe ◽  
L.M. LeBlanc ◽  
K.L. Gilbert
Keyword(s):  
Hydroxyl Airglow

An update on the hydroxyl airglow temperature record from the Auroral Station in Adventdalen, Svalbard (1980–2005)

2007 ◽  
Vol 85 (2) ◽  
pp. 143-151 ◽  
Author(s):  
M E Dyrland ◽  
F Sigernes
Keyword(s):  
Solar Rotation ◽  
Temperature Fluctuations ◽  
Winter Temperature ◽  
Temperature Record ◽  
Positive Temperature ◽  
Spectral Measurements ◽  
Daily Average ◽  
Winter Temperatures ◽  
Hydroxyl Airglow ◽  
Average Winter Temperature

This paper reports on the daily mesospheric winter temperature series derived from ground-based spectral measurements of the hydroxyl airglow layer from the Auroral Station in Adventdalen near Longyearbyen, Svalbard (78°N, 15°E). Temperature estimates from the four latest seasons (2001–2002 to 2004–2005) have been added to the series reported by Sigernes et al. J. Geophys. Res. 108(A9), 1342 (2003). Lomb–Scargle periodogram analyses were performed on both hourly and daily average temperatures to look for significant periods. From the daily means, ∼24 and ∼26 d oscillations that are consistent with a solar rotation modulation of the atmosphere were identified. Analyses of the hourly averaged data did not reveal any considerable diurnal and semidiurnal periods in the temperatures. The 2003–2004 mesopause winter was one of the warmest reported over Svalbard during the last 25 years. It is common to observe within a few days temperature fluctuations in the range 20–40 K. Some years show far less variation than others. The overall daily average winter temperature is 209 K. The annual mean winter temperatures show a slightly positive temperature trend (+0.2 ± 0.1 K/year), on the verge of being a statistically significant change in the winter mesospheric temperatures over Svalbard.PACS Nos.: 92.60.hc, 07.20.Dt, 93.30.Sq, 92.60.hw

scholarly journals Effect of water vapour absorption on hydroxyl temperatures measured from Svalbard

2017 ◽  
Vol 35 (3) ◽  
pp. 481-491 ◽  
Author(s):  
Joshua M. Chadney ◽  
Daniel K. Whiter ◽  
Betty S. Lanchester
Keyword(s):  
Water Vapour ◽  
Atmospheric Water ◽  
Echelle Spectrograph ◽  
Water Vapour Content ◽  
Atmospheric Water Vapour ◽  
Transmission Coefficients ◽  
Hydroxyl Airglow ◽  
Water Vapour Absorption ◽  
Vibrational Bands ◽  
High Throughput Imaging

Abstract. We model absorption by atmospheric water vapour of hydroxyl airglow emission using the HIgh-resolution TRANsmission molecular absorption database (HITRAN2012). Transmission coefficients are provided as a function of water vapour column density for the strongest OH Meinel emission lines in the (8–3), (5–1), (9–4), (8–4), and (6–2) vibrational bands. These coefficients are used to determine precise OH(8–3) rotational temperatures from spectra measured by the High Throughput Imaging Echelle Spectrograph (HiTIES), installed at the Kjell Henriksen Observatory (KHO), Svalbard. The method described in this paper also allows us to estimate atmospheric water vapour content using the HiTIES instrument.

scholarly journals Observation of Quasiperiodic Structures in the Hydroxyl Airglow on Scales Below 100 m

2018 ◽  
Vol 123 (19) ◽  
pp. 10,935-10,942 ◽  
Author(s):  
Christoph Franzen ◽  
Patrick Joseph Espy ◽  
Robert Edward Hibbins ◽  
Anlaug Amanda Djupvik
Keyword(s):  
Hydroxyl Airglow ◽  
Quasiperiodic Structures

scholarly journals A comparison of ground-based hydroxyl airglow temperatures with SABER/TIMED measurements over 23° N, India

2017 ◽  
Vol 35 (3) ◽  
pp. 353-363 ◽  
Author(s):  
Navin Parihar ◽  
Dupinder Singh ◽  
Subramanian Gurubaran
Keyword(s):  
Imaging System ◽  
Transition Probabilities ◽  
Mean Value ◽  
Large Temperature ◽  
Kinetic Temperature ◽  
Emission Layer ◽  
Intensity Information ◽  
Volume Emission ◽  
Hydroxyl Airglow ◽  
Temperature Inversions

Abstract. Ground-based observations of OH (6, 2) Meinel band nightglow were carried out at Ranchi (23.3° N, 85.3° E), India, during January–March 2011, December 2011–May 2012 and December 2012–March 2013 using an all-sky imaging system. Near the mesopause, OH temperatures were derived from the OH (6, 2) Meinel band intensity information. A limited comparison of OH temperatures (TOH) with SABER/TIMED measurements in 30 cases was performed by defining almost coincident criterion of ±1.5° latitude–longitude and ±3 min of the ground-based observations. Using SABER OH 1.6 and 2.0 µm volume emission rate profiles as the weighing function, two sets of OH-equivalent temperature (T1. 6 and T2. 0 respectively) were estimated from its kinetic temperature profile for comparison with OH nightglow measurements. Overall, fair agreement existed between ground-based and SABER measurements in the majority of events within the limits of experimental errors. Overall, the mean value of OH-derived temperatures and SABER OH-equivalent temperatures were 197.3 ± 4.6, 192.0 ± 10.8 and 192.7 ± 10.3 K, and the ground-based temperatures were 4–5 K warmer than SABER values. A difference of 8 K or more is noted between two measurements when the peak of the OH emission layer lies in the vicinity of large temperature inversions. A comparison of OH temperatures derived using different sets of Einstein transition probabilities and SABER measurements was also performed; however, OH temperatures derived using Langhoff et al. (1986) transition probabilities were found to compare well.

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