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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 35, issue 3
Ann. Geophys., 35, 353-363, 2017
https://doi.org/10.5194/angeo-35-353-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 35, 353-363, 2017
https://doi.org/10.5194/angeo-35-353-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 07 Mar 2017

Regular paper | 07 Mar 2017

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

Navin Parihar1, Dupinder Singh2, and Subramanian Gurubaran2 Navin Parihar et al.
  • 1Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Tirunelveli 627 011, India
  • 2Indian Institute of Geomagnetism, Navi Mumbai 410 218, India

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 ±3min of the ground-based observations. Using SABER OH 1.6 and 2.0µm 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±10.3K, and the ground-based temperatures were 4–5K warmer than SABER values. A difference of 8K 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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Using an all-sky imager, near-mesopause OH temperatures were derived from OH(6, 2) Meinel band intensity measurements. A limited comparison of OH temperatures with SABER/TIMED measurements performed by defining almost-coincident criteria of ±1.5° latitude–longitude and ±3 min indicated fair agreement between ground-based and SABER measurements in general. The difference of two measurements increased when the peak of the OH emission layer lay in the vicinity of large temperature inversions.
Using an all-sky imager, near-mesopause OH temperatures were derived from OH(6, 2) Meinel band...
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