Energy conversion in cometary atmospheres Hybrid modeling of 67P/Churyumov-Gerasimenko

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Lindkvist, J. Hamrin, M. Gunell, H. Nilsson, H. Wedlund, C. S. Kallio, E. Mann, I. Pitkanen, T. Karlsson, T. 2018-12-10T10:23:47Z 2018-12-10T10:23:47Z 2018-08-21
dc.identifier.citation Lindkvist , J , Hamrin , M , Gunell , H , Nilsson , H , Wedlund , C S , Kallio , E , Mann , I , Pitkanen , T & Karlsson , T 2018 , ' Energy conversion in cometary atmospheres Hybrid modeling of 67P/Churyumov-Gerasimenko ' Astronomy and Astrophysics , vol. 616 , 81 . DOI: 10.1051/0004-6361/201732353 en
dc.identifier.issn 1432-0746
dc.identifier.other PURE UUID: 90575c15-2179-43dd-bad5-684b3b45fdd5
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE FILEURL:
dc.description.abstract Aims. We wish to investigate the energy conversion between particles and electromagnetic fields and determine the location where it occurs in the plasma environment of comets. Methods. We used a hybrid plasma model that included photoionization, and we considered two cases of the solar extreme ultraviolet flux. Other parameters corresponded to the conditions of comet 67P/Churyumov-Gerasimenko at a heliocentric distance of 1.5 AU. Results. We find that a shock-like structure is formed upstream of the comet and acts as an electromagnetic generator, similar to the bow shock at Earth that slows down the solar wind. The Poynting flux transports electromagnetic energy toward the inner coma, where newly born cometary ions are accelerated. Upstream of the shock-like structure, we find local energy transfer from solar wind ions to cometary ions. We show that mass loading can be a local process with a direct transfer of energy, but also part of a dynamo system with electromagnetic generators and loads. Conclusions. The energization of cometary ions is governed by a dynamo system for weak ionization, but changes into a large conversion region with local transfer of energy directly from solar wind protons for high ionization. en
dc.format.extent 10
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Astronomy and Astrophysics en
dc.relation.ispartofseries Volume 616 en
dc.rights openAccess en
dc.subject.other 115 Astronomy and space science en
dc.title Energy conversion in cometary atmospheres Hybrid modeling of 67P/Churyumov-Gerasimenko en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Umeå University
dc.contributor.department Royal Belgian Institute for Space Aeronomy
dc.contributor.department Swedish Institute of Space Physics
dc.contributor.department University of Oslo
dc.contributor.department Department of Electronics and Nanoengineering
dc.contributor.department Univ Tromso, UiT The Arctic University of Tromso, Dept Phys & Technol
dc.contributor.department Royal Institute of Technology
dc.subject.keyword comets: individual: 67P/Churyumov-Gerasimenko
dc.subject.keyword Sun: UV radiation
dc.subject.keyword solar wind
dc.subject.keyword methods: numerical
dc.subject.keyword plasmas
dc.subject.keyword acceleration of particles
dc.subject.keyword SOLAR-WIND
dc.subject.keyword BOW SHOCK
dc.subject.keyword PLASMA ENVIRONMENT
dc.subject.keyword SIMULATION CODE
dc.subject.keyword MAGNETIC-FIELD
dc.subject.keyword IONS
dc.subject.keyword 115 Astronomy and space science
dc.identifier.urn URN:NBN:fi:aalto-201812106171
dc.identifier.doi 10.1051/0004-6361/201732353
dc.type.version publishedVersion

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