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Solar wind dynamics...
Solar wind dynamics around a comet : A 2D semi-analytical kinetic model
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- Behar, Etienne (author)
- Luleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna
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- Tabone, B. (author)
- LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Université, UPMC Univ. Paris
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- Saillenfest, M. (author)
- IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Université, UPMC Univ. Paris
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- Henri, P. (author)
- LPC2E, CNRS, Orléans
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- Deca, J. (author)
- Laboratory for Atmospheric and Space Physics (LASP), University of Colorado Boulder
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- Lindkvist, Jesper, Doctor, 1986- (author)
- Umeå universitet,Institutionen för fysik,Umeå University, Department of Physics
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- Holmström, Mats (author)
- Swedish Institute of Space Physics, Kiruna
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- Nilsson, Hans (author)
- Luleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna
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(creator_code:org_t)
- 2018-11-27
- 2018
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 620
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https://doi.org/10.1...
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Abstract
Subject headings
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- Aims.We aim at analytically modelling the solar wind proton trajectories during their interaction with a partially ionised cometaryatmosphere, not in terms of bulk properties of the flow but in terms of single particle dynamics.Methods.We first derive a generalised gyromotion, in which the electric field is reduced to its motional component. Steady-stateis assumed, and simplified models of the cometary density and of the electron fluid are used to express the force experienced byindividual solar wind protons during the interaction.Results.A three-dimensional (3D) analytical expression of the gyration of two interacting plasma beams is obtained. Applying it to acomet case, the force on protons is always perpendicular to their velocity and has an amplitude proportional to 1/r2. The solar winddeflection is obtained at any point in space. The resulting picture presents a caustic of intersecting trajectories, and a circular regionis found that is completely free of particles. The particles do not lose any kinetic energy and this absence of deceleration, togetherwith the solar wind deflection pattern and the presence of a solar wind ion cavity, is in good agreement with the general results of theRosettamission.Conclusions.The qualitative match between the model and thein situdata highlights how dominant the motional electric field isthroughout most of the interaction region for the solar wind proton dynamics. The model provides a simple general kinetic descriptionof how momentum is transferred between these two collisionless plasmas. It also shows the potential of this semi-analytical modelfor a systematic quantitative comparison to the data.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- 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)
Keyword
- Atmosfärsvetenskap
- Atmospheric science
- comets: general
Publication and Content Type
- ref (subject category)
- art (subject category)
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