@article{Fuselier:2016:mnras/stw2149,
author = {Fuselier, SA and Altwegg, K and Balsiger, H and Berthelier, JJ and Beth, A and Bieler, A and Briois, C and Broiles, TW and Burch, JL and Calmonte, U and Cessateur, G and Combi, M and De, Keyser J and Fiethe, B and Galand, M and Gasc, S and Gombosi, TI and Gunell, H and Hansen, KC and Hässig, M and Heritier, KL and Korth, A and Le, Roy L and Luspay-Kuti, A and Mall, U and Mandt, KE and Petrinec, SM and Rème, H and Rinaldi, M and Rubin, M and Sémon, T and Trattner, KJ and Tzou, C-Y and Vigren, E and Waite, JH and Wurz, P},
doi = {mnras/stw2149},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {S67--S77},
title = {Ion chemistry in the coma of comet 67P near perihelion},
url = {http://dx.doi.org/10.1093/mnras/stw2149},
volume = {462},
year = {2016}
}

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TY  - JOUR
AB  - The coma and the comet–solar wind interaction of comet 67P/Churyumov–Gerasimenko changed dramatically from the initial Rosetta spacecraft encounter in 2014 August through perihelion in 2015 August. Just before equinox (at 1.6 au from the Sun), the solar wind signal disappeared and two regions of different cometary ion characteristics were observed. These ‘outer’ and ‘inner’ regions have cometary ion characteristics similar to outside and inside the ion pileup region observed during the Giotto approach to comet 1P/Halley. Rosetta/Double-Focusing Mass Spectrometer ion mass spectrometer observations are used here to investigate the H3O+/H2O+ ratio in the outer and inner regions at 67P/ Churyumov–Gerasimenko. The H3O+/H2O+ ratio and the H3O+ signal are observed to increase in the transition from the outer to the inner region and the H3O+ signal appears to be weakly correlated with cometary ion energy. These ion composition changes are similar to the ones observed during the 1P/Halley flyby. Modelling is used to determine the importance of neutral composition and transport of neutrals and ions away from the nucleus. This modelling demonstrates that changes in the H3O+/H2O+ ratio appear to be driven largely by transport properties and only weakly by neutral composition in the coma.
AU  - Fuselier,SA
AU  - Altwegg,K
AU  - Balsiger,H
AU  - Berthelier,JJ
AU  - Beth,A
AU  - Bieler,A
AU  - Briois,C
AU  - Broiles,TW
AU  - Burch,JL
AU  - Calmonte,U
AU  - Cessateur,G
AU  - Combi,M
AU  - De,Keyser J
AU  - Fiethe,B
AU  - Galand,M
AU  - Gasc,S
AU  - Gombosi,TI
AU  - Gunell,H
AU  - Hansen,KC
AU  - Hässig,M
AU  - Heritier,KL
AU  - Korth,A
AU  - Le,Roy L
AU  - Luspay-Kuti,A
AU  - Mall,U
AU  - Mandt,KE
AU  - Petrinec,SM
AU  - Rème,H
AU  - Rinaldi,M
AU  - Rubin,M
AU  - Sémon,T
AU  - Trattner,KJ
AU  - Tzou,C-Y
AU  - Vigren,E
AU  - Waite,JH
AU  - Wurz,P
DO  - mnras/stw2149
EP  - 77
PY  - 2016///
SN  - 1365-2966
SP  - 67
TI  - Ion chemistry in the coma of comet 67P near perihelion
T2  - Monthly Notices of the Royal Astronomical Society
UR  - http://dx.doi.org/10.1093/mnras/stw2149
UR  - http://hdl.handle.net/10044/1/43339
VL  - 462
ER  - 

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