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Lower hybrid waves at comet 67P/Churyumov-Gerasimenko
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0003-3725-4920
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Space Plasma Physics.ORCID iD: 0000-0001-7854-6001
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0002-1046-746x
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0003-2926-6761
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2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 469, p. S29-S38Article in journal (Refereed) Published
Abstract [en]

We investigate the generation of waves in the lower hybrid frequency range by density gradients in the near plasma environment of comet 67P/Churyumov-Gerasimenko. When the plasma is dominated by water ions from the comet, a situation with magnetized electrons and unmagnetized ions is favourable for the generation of lower hybrid waves. These waves can transfer energy between ions and electrons and reshape the plasma environment of the comet. We consider cometocentric distances out to a few hundred km. We find that when the electron motion is not significantly interrupted by collisions with neutrals, large average gradients within tens of km of the comet, as well as often observed local large density gradients at larger distances, are often likely to be favourable for the generation of lower hybrid waves. Overall, we find that waves in the lower hybrid frequency range are likely to be common in the near plasma environment.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2017. Vol. 469, p. S29-S38
Keywords [en]
plasmas, waves, comets: general
National Category
Fusion, Plasma and Space Physics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-376682DOI: 10.1093/mnras/stx868ISI: 000443940500003OAI: oai:DiVA.org:uu-376682DiVA, id: diva2:1289166
Conference
International Conference on Cometary Science - Comets - A New Vision after Rosetta and Philae, NOV 14-18, 2016, Toulouse, FRANCE
Available from: 2019-02-15 Created: 2019-02-15 Last updated: 2019-02-15Bibliographically approved

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André, MatsOdelstad, EliasGraham, Daniel B.Eriksson, Anders I.Vigren, ErikNorgren, CeciliaJohansson, Fredrik L.

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André, MatsOdelstad, EliasGraham, Daniel B.Eriksson, Anders I.Vigren, ErikNorgren, CeciliaJohansson, Fredrik L.
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Swedish Institute of Space Physics, Uppsala DivisionSpace Plasma Physics
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Monthly notices of the Royal Astronomical Society
Fusion, Plasma and Space PhysicsAstronomy, Astrophysics and Cosmology

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