[en] We present here a 2D-model of photochemistry for computing the production and loss mechanisms of the O([SUP]1[/SUP]S) and O([SUP]1[/SUP]D) states, which are responsible for the emission lines at 577.7 nm, 630 nm, and 636.4 nm, in case of the comet 1P/Halley. The presence of O[SUB]2[/SUB] within cometary atmospheres, measured by the in-situ ROSETTA and GIOTTO missions, necessitates a revision of the usual photochemical models. Indeed, the photodissociation of molecular oxygen also leads to a significant production of oxygen in excited electronic states. In order to correctly model the solar UV flux absorption, we consider here a 2D configuration. While the green to red-doublet ratio is not affected by the solar UV flux absorption, estimates of the red-doublet and green lines emissions are, however, overestimated by a factor of two in the 1D model compared to the 2D model. Considering a spherical symmetry, emission maps can be deduced from the 2D model in order to be directly compared to ground and/or in-situ observations.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Cessateur, G.; Space Physics Division, Royal Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium
De Keyser, J.; Space Physics Division, Royal Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium
Maggiolo, R.; Space Physics Division, Royal Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium
Rubin, M.; Physikalisches Institut, University of Bern, Sidlerstr. 5, CH-3012 Bern, Switzerland
Gronoff, G.; Science Directorate, Chemistry and Dynamics Branch, NASA Langley Research Center, Hampton, Virginia USA ; SSAI, Hampton, Virginia USA
Gibbons, A.; Space Physics Division, Royal Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium ; Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, Av. F. D. Roosevelt 50, B-1050 Brussels, Belgium
Jehin, Emmanuel ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Dhooghe, F.; Space Physics Division, Royal Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium
Gunell, H.; Space Physics Division, Royal Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium
Vaeck, N.; Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, Av. F. D. Roosevelt 50, B-1050 Brussels, Belgium
Loreau, J.; Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, Av. F. D. Roosevelt 50, B-1050 Brussels, Belgium)
Language :
English
Title :
2D-photochemical model for forbidden oxygen line emission for comet 1P/Halley
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