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  3. Photochemistry of forbidden oxygen lines in the inner coma of 67P/Churyumov-Gerasimenko
 

Photochemistry of forbidden oxygen lines in the inner coma of 67P/Churyumov-Gerasimenko

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BORIS DOI
10.7892/boris.97211
Date of Publication
2016
Publication Type
Article
Division/Institute

Physikalisches Instit...

Center for Space and ...

Author
Cessateur, G.
Keyser, J. De
Maggiolo, R.
Gibbons, A.
Gronoff, G.
Gunell, H.
Dhooghe, F.
Loreau, J.
Vaeck, N.
Altwegg, Kathrinorcid-logo
Physikalisches Institut, Weltraumforschung und Planetologie (WP)
Bieler, Andréorcid-logo
Physikalisches Institut, Weltraumforschung und Planetologie (WP)
Briois, C.
Calmonte, Ursina Mariaorcid-logo
Physikalisches Institut, Weltraumforschung und Planetologie (WP)
Combi, M. R.
Fiethe, B.
Fuselier, S. A.
Gombosi, T. I.
Hässig, Myrthaorcid-logo
Physikalisches Institut, Weltraumforschung und Planetologie (WP)
Le Roy, Lénaorcid-logo
Center for Space and Habitability (CSH)
Neefs, E.
Rubin, Martinorcid-logo
Physikalisches Institut, Weltraumforschung und Planetologie (WP)
Sémon, Thierry
Physikalisches Institut, Weltraumforschung und Planetologie (WP)
Subject(s)

500 - Science::520 - ...

500 - Science::530 - ...

600 - Technology::620...

Series
Journal of Geophysical Research: Space Physics
ISSN or ISBN (if monograph)
2169-9380
Publisher
AGU Publications
Language
English
Publisher DOI
10.1002/2015ja022013
Description
Observations of the green and red-doublet emission lines have previously been realized for several comets. We present here a chemistry-emission coupled model to study the production and loss mechanisms of the O(¹S) and O(¹D) states, which are responsible for the emission lines of interest for comet 67P/Churyumov-Gerasimenko. The recent discovery of O₂ in significant abundance relative to water 3.80 ± 0.85% within the coma of 67P has been taken into consideration for the first time in such models. We evaluate the effect of the presence of O₂ on the green to red-doublet emission intensity ratio, which is traditionally used to assess the CO₂ abundance within cometary atmospheres. Model simulations, solving the continuity equation with transport, show that not taking O₂ into account leads to an underestimation of the CO₂ abundance within 67P, with a relative error of about 25%. This strongly suggests that the green to red-doublet emission intensity ratio alone is not a proper tool for determining the CO₂ abundance, as previously suggested. Indeed, there is no compelling reason why O₂ would not be a common cometary volatile, making revision of earlier assessments regarding the CO₂ abundance in cometary atmospheres necessary. The large uncertainties of the CO₂ photodissociation cross section imply that more studies are required in order to better constrain the O(¹S) and O(¹D) production through this mechanism. Space weather phenomena, such as powerful solar flares, could be used as tools for doing so, providing additional information on a good estimation of the O₂ abundance within cometary atmospheres.
Handle
https://boris-portal.unibe.ch/handle/20.500.12422/150912
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jgra52340 (1).pdftextAdobe PDF726.62 KBAttribution-NonCommercial-NoDerivatives (CC BY-NC-ND 4.0)publishedOpen
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