Discovery of a new orange feature from FeO in the night airglow with the OSIRIS spectrograph

Details Discovery of a new orange feature from FeO in the night airglow with the OSIRIS spectrograph Discovery of a new orange feature from FeO in the night airglow with the OSIRIS spectrograph

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa52a..08e&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA52A-08

Other

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0317] Atmospheric Composition And Structure / Chemical Kinetic And Photochemical Properties, [0343] Atmospheric Composition And Structure / Planetary Atmospheres, [0394] Atmospheric Composition And Structure / Instruments And Techniques

Scientific paper

The discovery of a new airglow feature in the earth’s atmosphere is presented. The FeO orange feature has been detected in the night airglow spectrum with the OSIRIS spectrograph on the ODIN spacecraft. The orange chemiluminescent airglow has been measured in the spectral region from 530 nm to 650 nm. The OSIRIS imaging spectrograph measures the airglow spectrum over the 275 to 815 nm wavelength range. At the spectral resolution of OSIRIS, the band systems of FeO appear as a weak continuum-like structure in the 600 nm region at 85 km in the upper mesosphere. As the satellite scans, spectra are obtained of the terrestrial limb with tangent altitudes ranging between 5 km and 110 km. Since the instrument is a CCD spectrograph, all wavelengths are exposed simultaneously thus avoiding the effect of temporal intensity variations inherently present in spectrally scanning instruments. The relative spectral sensitivity over the entire wavelength range has been quantified to yield an estimated 5% precision. In order to maintain accurate on-orbit spectral calibrations an atmospheric radiation model with multiple Rayleigh scattering is employed to regularly update the OSIRIS spectral response. Averages of spectra at a series of tangent limb altitudes were assembled from numerous limb scans at low latitudes. Limb radiance altitude profiles for a number of observed spectral features were obtained from these averaged spectra. These radiance profiles were inverted to obtain volume emission rate altitude profiles. Synthetic spectra for the hydroxyl and O2 Herzberg airglow emission bands were generated and scaled with the observed band intensities to remove the known airglow components in order to isolate the underlying airglow feature. Tropical latitudes were chosen to minimize the classic green airglow continuum from the reaction of nitric oxide with atomic oxygen since nitric oxide is small at 90 km in the tropics. Other potential photochemical sources of the orange glow are reviewed and their likely importance assessed as a mechanism for the current observations. A comparison of the observed spectrum feature with laboratory measurements of the FeO emission spectrum from 530 to 650 nm shows a remarkable similarity, positively identifying FeO from iron and ozone as the source of the orange airglow feature. The same orange feature has been observed in the afterglow of meteorite trains. The similarity of of the meteorite afterglow spectrum with the new airglow feature was demonstrated by comparison of the two. The measured volumne emission rate altitude profiles of the FeO feature were compared with altitude profiles of the atomic sodium emission at 590 nm and OH emission bands in the same OSIRIS spectrum; all three of these profiles are similar. This comparison is consistent with the laboratory excitation reaction of atomic iron with ozone since all three emissions orignate from the reaction of atoms with ozone. Examination of several other airglow spectra measured by other investigators showed evidence of the presence of the orange FeO feature although it has not been previously identified as such.

Affiliated with

Also associated with

No associations

Rating

Discovery of a new orange feature from FeO in the night airglow with the OSIRIS spectrograph does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Discovery of a new orange feature from FeO in the night airglow with the OSIRIS spectrograph, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discovery of a new orange feature from FeO in the night airglow with the OSIRIS spectrograph will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1506248