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Solar wind charge e...
Solar wind charge exchange in cometary atmospheres : III. Results from the Rosetta mission to comet 67P/Churyumov-Gerasimenko
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- Wedlund, Cyril Simon (författare)
- Department of Physics, University of Oslo, Oslo, Norway
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- Behar, Etienne (författare)
- Luleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna, Sweden
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- Nilsson, Hans (författare)
- Luleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna, Sweden
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- Alho, Markku (författare)
- Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, Aalto, Finland
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- Kallio, Esa (författare)
- Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, Aalto, Finland
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- Gunell, Herbert (författare)
- Umeå universitet,Institutionen för fysik,Royal Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180 Brussels, Belgium,Royal Belgian Institute for Space Aeronomy, Brussels, Belgium. Department of Physics, Umeå University, Umeå, Sweden
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- Bodewits, Dennis (författare)
- Physics Department, Auburn University, Auburn, USA
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- Heritier, Kevin (författare)
- Department of Physics, Imperial College London, London, UK
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- Galand, Marina (författare)
- Department of Physics, Imperial College London, London, UK
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- Beth, Arnaud (författare)
- Department of Physics, Imperial College London, London, UK
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- Rubin, Martin (författare)
- Space Research and Planetary Sciences, University of Bern, Bern, Switzerland
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- Altwegg, Kathrin (författare)
- Space Research and Planetary Sciences, University of Bern, Bern, Switzerland
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- Volwerk, Martin (författare)
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria
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- Gronoff, Guillaume (författare)
- Science directorate, Chemistry & Dynamics branch, NASA Langley Research Center, Hampton, Virginia, USA. SSAI, Hampton, Virginia, USA
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- Hoekstra, Ronnie (författare)
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
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(creator_code:org_t)
- 2019-09-20
- 2019
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 630
- Relaterad länk:
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Context. Solar wind charge-changing reactions are of paramount importance to the physico-chemistry of the atmosphere of a comet. The ESA/Rosetta mission to comet 67P/Churyumov-Gerasimenko (67P) provides a unique opportunity to study charge-changing processes in situ.Aims. To understand the role of these reactions in the evolution of the solar wind plasma and interpret the complex in situ measurements made by Rosetta, numerical or analytical models are necessary.Methods. We used an extended analytical formalism describing solar wind charge-changing processes at comets along solar wind streamlines. The model is driven by solar wind ion measurements from the Rosetta Plasma Consortium-Ion Composition Analyser (RPC-ICA) and neutral density observations from the Rosetta Spectrometer for Ion and Neutral Analysis-Comet Pressure Sensor (ROSINA-COPS), as well as by charge-changing cross sections of hydrogen and helium particles in a water gas.Results. A mission-wide overview of charge-changing efficiencies at comet 67P is presented. Electron capture cross sections dominate and favor the production of He and H energetic neutral atoms (ENAs), with fluxes expected to rival those of H+ and He2+ ions.Conclusions. Neutral outgassing rates are retrieved from local RPC-ICA flux measurements and match ROSINA estimates very well throughout the mission. From the model, we find that solar wind charge exchange is unable to fully explain the magnitude of the sharp drop in solar wind ion fluxes observed by Rosetta for heliocentric distances below 2.5 AU. This is likely because the model does not take the relative ion dynamics into account and to a lesser extent because it ignores the formation of bow-shock-like structures upstream of the nucleus. This work also shows that the ionization by solar extreme-ultraviolet radiation and energetic electrons dominates the source of cometary ions, although solar wind contributions may be significant during isolated events.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Rymd- och flygteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Aerospace Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- comets: general
- comets: individual: 67P/Churyumov-Gerasimenko
- instrumentation: detectors
- solar wind
- methods: analytical
- plasmas
- Atmosfärsvetenskap
- Atmospheric Science
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Wedlund, Cyril S ...
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Behar, Etienne
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Nilsson, Hans
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Alho, Markku
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Kallio, Esa
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Gunell, Herbert
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Bodewits, Dennis
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Heritier, Kevin
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Galand, Marina
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Beth, Arnaud
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Rubin, Martin
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Altwegg, Kathrin
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Volwerk, Martin
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Gronoff, Guillau ...
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Hoekstra, Ronnie
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