CHANGES in the PHYSICAL ENVIRONMENT of the INNER COMA of 67P/CHURYUMOV-GERASIMENKO with DECREASING HELIOCENTRIC DISTANCE

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题名:	CHANGES in the PHYSICAL ENVIRONMENT of the INNER COMA of 67P/CHURYUMOV-GERASIMENKO with DECREASING HELIOCENTRIC DISTANCE
作者:	葉永烜;Bodewits, D.;Lara, L. M.;A'Hearn, M. F.;La Forgia, F.;Gicquel, A.;Kovacs, G.;Knollenberg, J.;Lazzarin, M.;Lin (林忠義), Z.-Y.;Shi, X.;Snodgrass, C.;Tubiana, C.;Sierks, H.;Barbieri, C.;Lamy, P. L.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;Barucci, M. A.;Bertaux, J.-L.;Bertini, I.;Boudreault, S.;Cremonese, G.;Da Deppo, V.;Davidsson, B.;Debei, S.;De Cecco, M.;Fornasier, S.;Fulle, M.;Groussin, O.;Gutiérrez, P. J.;Güttler, C.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Kramm, J.-R.;Kührt, E.;Küppers, M.;López-Moreno, J. J.;Marzari, F.;Naletto, G.;Oklay, N.;Thomas, N.;Toth, I.;Vincent, J.-B.
贡献者:	理學院天文研究所
关键词:	ASTROPHYSICS;ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;atomic processes;CAMERAS;CARBON DIOXIDE;CARBON NITRIDES;COMETS;comets: individual (67P/Churyumov-Gerasimenko);COSMIC ELECTRONS;CYANIDES;Earth and Planetary Astrophysics;Electron impact excitation;ELECTRON TEMPERATURE;Emission;Evolution;EXCITATION;FILTERS;IMAGE PROCESSING;molecular processes;Onboard;PLASMA;plasmas;Plumes;radiation mechanisms: non-thermal;Sciences of the Universe;SPACE VEHICLES;SPATIAL DISTRIBUTION;techniques: image processing;WATER
日期:	2016-11-01
上传时间:	2026-04-21 14:58:16 (UTC+8)
出版者:	IOP Publishing Ltd.;United States: The American Astronomical Society
摘要:	摘要： ABSTRACT The Wide Angle Camera of the OSIRIS instrument on board the Rosetta spacecraft is equipped with several narrow-band filters that are centered on the emission lines and bands of various fragment species. These are used to determine the evolution of the production and spatial distribution of the gas in the inner coma of comet 67P with time and heliocentric distance, here between 2.6 and 1.3 au pre-perihelion. Our observations indicate that the emission observed in the OH, O i, CN, NH, and NH2 filters is mostly produced by dissociative electron impact excitation of different parent species. We conclude that CO2 rather than H2O is a significant source of the [O i] 630 nm emission. A strong plume-like feature observed in the CN and O i filters is present throughout our observations. This plume is not present in OH emission and indicates a local enhancement of the CO2/H2O ratio by as much as a factor of 3. We observed a sudden decrease in intensity levels after 2015 March, which we attribute to decreased electron temperatures in the first few kilometers above the surface of the nucleus. 其他題名： AJ 其他題名： Astron. J 出版者： United States: The American Astronomical Society 出版日期： 2016-11-01 出處： The Astronomical journal, 2016-11, Vol.152 (5), p.130-130 資源來源： Institute of Physics Journals 版權： 2016. The American Astronomical Society. All rights reserved. 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 0004-6256 識別號： ISSN: 1538-3881 識別號： EISSN: 1538-3881 識別號： DOI: 10.3847/0004-6256/152/5/130
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