Physics – Chemical Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa43a1736s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA43A-1736
Physics
Chemical Physics
[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [0341] Atmospheric Composition And Structure / Middle Atmosphere: Constituent Transport And Chemistry, [3332] Atmospheric Processes / Mesospheric Dynamics
Scientific paper
Emission from the FeO molecule is a long-sought feature of the terrestrial nightglow. Current work in analyzing data from the OSIRIS spectrometer on the Odin satellite and the sky spectra from the ESI spectrograph on the Keck II telescope demonstrate that quasi-continuous emission near 600 nm can be identified as to be from excited FeO, by comparison with laboratory spectra obtained from the reaction between Fe and O3 [West and Broida, 1975; Jenniskens et al., 2000] and meteor trains. This emission is a ubiquitous feature in astronomical sky spectra obtained both with ESI and with the UVES/VLT system in Paranal, Chile. Integrated areas of the band profile in the 560-620 nm region with ESI show that the overhead continuum intensity is 3-4 times brighter than the sodium 589 nm lines, although the FeO emission extends well beyond 620 nm, and may reach several hundred Rayleighs. The temporal behavior of the FeO emission is closely related to that of both the sodium emission and the OH Meinel bands. This is not surprising given that all three of these nightglow emissions involve reaction with ozone. The temporal behavior needs to be modeled using global emission models because of the complexities of the intermediate reactions involved in generating the emitting states of FeO, Na and OH. Acknowledgements DVS was supported by NSF Aeronomy and CEDAR postdoc fellowship award, NSF grant ATM-0924781. TGS was supported by grant ATM-0637433 from NSF Aeronomy. References Jenniskens P., Lacey M., Allan B. J., Self D. E., Plane J. M. C., 2000, FeO "Orange Arc" emission detected in optical spectrum of Leonid persistent train. Earth, Moon and Planets 82-83, 429-438 West, J. B. and Broida, H.P.,1975, Chemiluminescence and photoluminescence of diatomic iron oxide. Journal of Chemical Physics, 62, 2566-2574.
Saran D. V.
Slanger Tom G.
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