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Evolution of the io...
Evolution of the ion environment of comet 67P/Churyumov-Gerasimenko
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- Nilsson, Hans (author)
- Luleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Box 812, 981 28 Kiruna, Sweden
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- Wieser, G. Stenberg (author)
- Swedish Inst Space Phys, S-98128 Kiruna, Sweden.,Swedish Institute of Space Physics, Box 812, 981 28 Kiruna, Sweden
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- Behar, Etienne (author)
- Luleå tekniska universitet,Institutionen för system- och rymdteknik,Swedish Institute of Space Physics, Box 812, 981 28 Kiruna, Sweden
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- Wedlund, C. Simon (author)
- Aalto Univ, Sch Elect Engn, Dept Radio Sci & Engn, Aalto 00076, Finland.,Aalto University, School of Electrical Engineering, Department of Radio Science and Engineering, PO Box 13000, 00076 Aalto, Finland,Imperial College London, Exhibition Road, London SW7 2AZ, UK
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- Kallio, E. (author)
- Aalto Univ, Sch Elect Engn, Dept Radio Sci & Engn, Aalto 00076, Finland.,Aalto University, School of Electrical Engineering, Department of Radio Science and Engineering, PO Box 13000, 00076 Aalto, Finland
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- Gunell, H. (author)
- Belgian Inst Space Aeron, B-1180 Brussels, Belgium.,Belgian Institute for Space Aeronomy, avenue Circulaire 3, 1180 Brussels, Belgium
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- Edberg, Niklas J. T. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Institute of Space Physics, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, Sweden
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- Eriksson, Anders. I. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Institute of Space Physics, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, Sweden
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- Yamauchi, M. (author)
- Swedish Inst Space Phys, S-98128 Kiruna, Sweden.,Swedish Institute of Space Physics, Box 812, 981 28 Kiruna, Sweden
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- Koenders, C. (author)
- Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany.,TU – Braunschweig, Institute for Geophysics and extraterrestrial Physics, Mendelssohnstr. 3, 38106 Braunschweig, Germany
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- Wieser, M. (author)
- Swedish Inst Space Phys, S-98128 Kiruna, Sweden.,Swedish Institute of Space Physics, Box 812, 981 28 Kiruna, Sweden
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- Lundin, R. (author)
- Swedish Inst Space Phys, S-98128 Kiruna, Sweden.,Swedish Institute of Space Physics, Box 812, 981 28 Kiruna, Sweden
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- Barabash, S. (author)
- Swedish Inst Space Phys, S-98128 Kiruna, Sweden.,Swedish Institute of Space Physics, Box 812, 981 28 Kiruna, Sweden
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- Mandt, K. (author)
- Southwest Res Inst, San Antonio, TX 78238 USA.,Southwest Research Institute, 6220 Culebra Rd., San Antonio, TX 78238, USA
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- Burch, J. L. (author)
- Southwest Res Inst, San Antonio, TX 78238 USA.,Southwest Research Institute, 6220 Culebra Rd., San Antonio, TX 78238, USA
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- Goldstein, R. (author)
- Southwest Res Inst, San Antonio, TX 78238 USA.,Southwest Research Institute, 6220 Culebra Rd., San Antonio, TX 78238, USA
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- Mokashi, P. (author)
- Southwest Res Inst, San Antonio, TX 78238 USA.,Southwest Research Institute, 6220 Culebra Rd., San Antonio, TX 78238, USA
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- Carr, C. (author)
- Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England.,Rosetta Science Ground Segment, SRE-OOR, Office A006, European Space Astronomy Centre, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
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- Cupido, E. (author)
- Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England.,Imperial College London, Exhibition Road, London SW7 2AZ, UK
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- Fox, P. T. (author)
- Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England.,Imperial College London, Exhibition Road, London SW7 2AZ, UK
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- Szego, K. (author)
- Wigner Res Ctr Phys, H-1121 Budapest, Hungary.,Wigner Research Centre for Physics, 1121 Konkoly Thege street 29–33, Budapest, Hungary
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- Nemeth, Z. (author)
- Wigner Res Ctr Phys, H-1121 Budapest, Hungary.,Wigner Research Centre for Physics, 1121 Konkoly Thege street 29–33, Budapest, Hungary
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- Fedorovn, A. (author)
- Inst Rech Astrophys & Planetol, F-31028 Toulouse, France.,Institut de Recherche en Astrophysique et Planétologie, 31028 Toulouse, France
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- Sauvaud, J. -A (author)
- Institut de Recherche en Astrophysique et Planétologie, 31028 Toulouse, France
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- Koskinen, H. (author)
- Univ Helsinki, Dept Phys, Helsinki 00014, Finland.;Finnish Meteorol Inst, FIN-00101 Helsinki, Finland.,University of Helsinki, Department of Physics, PO Box 64, University of Helsinki, 00014 Helsinki, Finland; Finnish Meteorological Institute, PO BOX 503, 00101 Helsinki, Finland
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- Richter, I. (author)
- Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany.,TU – Braunschweig, Institute for Geophysics and extraterrestrial Physics, Mendelssohnstr. 3, 38106 Braunschweig, Germany
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- Lebreton, J. -P (author)
- Laboratoire de Physique et Chimie de l’Environnement et de l’Espace (LPC2E), UMR 7328 CNRS – Université d’Orléans, France
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- Henri, P. (author)
- Univ Orleans, UMR CNRS 7328, Lab Phys & Chim Environm & Espace LPC2E, F-45067 Orleans, France.,Laboratoire de Physique et Chimie de l’Environnement et de l’Espace (LPC2E), UMR 7328 CNRS – Université d’Orléans, France
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- Volwerk, M. (author)
- Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria.,Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042 Graz, Austria
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- Vallat, C. (author)
- European Space Astron Ctr, Rosetta Sci Ground Segment, SRE OOR, Off A006, Madrid, Spain.
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- Geiger, B. (author)
- European Space Astron Ctr, Rosetta Sci Ground Segment, SRE OOR, Off A006, Madrid, Spain.,Rosetta Science Ground Segment, SRE-OOR, Office A006, European Space Astronomy Centre, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
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(creator_code:org_t)
- 2015-10-30
- 2015
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 583
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Abstract
Subject headings
Close
- Context. The Rosetta spacecraft is escorting comet 67P/Churyumov-Gerasimenko from a heliocentric distance of >3.6 AU, where the comet activity was low, until perihelion at 1.24 AU. Initially, the solar wind permeates the thin comet atmosphere formed from sublimation. Aims. Using the Rosetta Plasma Consortium Ion Composition Analyzer (RPC-ICA), we study the gradual evolution of the comet ion environment, from the first detectable traces of water ions to the stage where cometary water ions accelerated to about 1 keV energy are abundant. We compare ion fluxes of solar wind and cometary origin. Methods. RPC-ICA is an ion mass spectrometer measuring ions of solar wind and cometary origins in the 10 eV-40 keV energy range. Results. We show how the flux of accelerated water ions with energies above 120 eV increases between 3.6 and 2.0 AU. The 24 h average increases by 4 orders of magnitude, mainly because high-flux periods become more common. The water ion energy spectra also become broader with time. This may indicate a larger and more uniform source region. At 2.0 AU the accelerated water ion flux is frequently of the same order as the solar wind proton flux. Water ions of 120 eV-few keV energy may thus constitute a significant part of the ions sputtering the nucleus surface. The ion density and mass in the comet vicinity is dominated by ions of cometary origin. The solar wind is deflected and the energy spectra broadened compared to an undisturbed solar wind. Conclusions. The flux of accelerated water ions moving from the upstream direction back toward the nucleus is a strongly nonlinear function of the heliocentric distance.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Rymd- och flygteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Aerospace Engineering (hsv//eng)
Keyword
- plasmas
- acceleration of particles
- comets: general
- comets: individual: 67P/Churyumov-Gerasimenko
- Atmosfärsvetenskap
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Nilsson, Hans
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Wieser, G. Stenb ...
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Behar, Etienne
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Wedlund, C. Simo ...
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Kallio, E.
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Gunell, H.
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show more...
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Edberg, Niklas J ...
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Eriksson, Anders ...
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Yamauchi, M.
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Koenders, C.
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Wieser, M.
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Lundin, R.
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Barabash, S.
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Mandt, K.
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Burch, J. L.
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Goldstein, R.
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Mokashi, P.
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Carr, C.
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Cupido, E.
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Fox, P. T.
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Szego, K.
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Nemeth, Z.
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Fedorovn, A.
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Sauvaud, J. -A
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Koskinen, H.
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Richter, I.
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Lebreton, J. -P
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Henri, P.
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Volwerk, M.
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Vallat, C.
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Geiger, B.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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Astronomy and As ...
- By the university
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Uppsala University
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Luleå University of Technology