Seasonal variations of OI 6300 � night airglow emission at Calcutta and other stations and its covariation with OI 5577 � emission

Abstract. The recent finding of an orange spectral feature in OSIRIS/Odin spectra of the night airglow near 87 km has raised interest in the origin of the emission. The feature was positively identified as the chemiluminescent FeO* emission where the iron is of meteoric origin. Since the meteorite source of atomic metals in the mesosphere contains both iron and nickel, with Ni being typically 6 % of Fe, it is expected that faint emissions involving Ni should also be present in the night airglow. The present study summarizes the laboratory observations of chemiluminescent NiO* emissions and includes a search for the NiO* signature in the night airglow. A very faint previously unidentified "continuum" extending longwave of 440 nm has been detected in the night airglow spectra obtained with two space-borne limb viewing instruments. Through a comparison with laboratory spectra this continuum is identified as arising from the NiO* emission. The altitude profile of the new airglow emission has also been measured. The similarity of the altitude profiles of the FeO* and NiO* emissions also suggests the emission is NiO as both can originate from reaction of the metal atoms with mesospheric ozone. The observed NiO* to FeO* ratio exhibits considerable variability; possible causes of this observed variation are briefly discussed.

Download Full-text

Seasonal variations of the nighttime O(1S) and OH airglow emission rates at mid-to-high latitudes in the context of the large-scale circulation

Journal of Geophysical Research Atmospheres ◽

10.1029/2007ja012854 ◽

2008 ◽

Vol 113 (A6) ◽

pp. n/a-n/a ◽

Cited By ~ 33

Author(s):

Guiping Liu ◽

Gordon G. Shepherd ◽

Raymond G. Roble

Keyword(s):

Seasonal Variations ◽

Large Scale ◽

Emission Rates ◽

High Latitudes ◽

Large Scale Circulation ◽

Airglow Emission

Download Full-text

O2 and OH Night Airglow Emission Derived from GOMOS-Envisat Instrument

Journal of Atmospheric and Oceanic Technology ◽

10.1175/jtech-d-13-00135.1 ◽

2014 ◽

Vol 31 (6) ◽

pp. 1301-1311 ◽

Cited By ~ 4

Author(s):

Christophe Bellisario ◽

Philippe Keckhut ◽

Laurent Blanot ◽

Alain Hauchecorne ◽

Pierre Simoneau

Keyword(s):

Error Analysis ◽

Atmospheric Chemistry ◽

Airglow Emission ◽

Monthly Average ◽

Stellar Occultation ◽

Ozone Monitoring ◽

Ccd Detectors ◽

Absorption Measurements ◽

Better Than ◽

Night Airglow

Abstract Global Ozone Monitoring by Occultation of Stars (GOMOS) was an instrument dedicated to the study of atmospheric chemistry based on the principle of stellar occultation. The signals delivered by the IR spectrometer coupled with two CCD detectors, initially used for absorption measurements, were analyzed in order to observe the night airglow resulting from O2 and OH emissions at 761.9 and 930 nm, respectively. The method to retrieve those emissions is described as well as the error analysis. The results of this first attempt are presented and discussed with respect to instrument characteristics, earth coverage, altitude resolution, and the ability of GOMOS data to contribute to night airglow investigations. Mean limb intensities are equal to 28.9 and 7.7 MR for O2 at 760 nm and OH at 930 nm, respectively. Individual O2 emissions are retrieved with an accuracy better than 15%, while the OH emission, which provides smaller intensities, is retrieved with an accuracy of 10% for the monthly average.

Download Full-text