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Birth of a Magnetosphere
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology. Swedish Institute of Space Physics, Kiruna, Sweden.ORCID iD: 0000-0002-7787-2160
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology. Swedish Institute of Space Physics, Kiruna, Sweden.ORCID iD: 0000-0003-0177-510X
Southwest Research Institute, San Antonio, TX, USA.
Department of Physics, Imperial College London, London, UK.
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2021 (English)In: Magnetospheres in the Solar System / [ed] Romain Maggiolo; Nicolas André; Hiroshi Hasegawa; Daniel T. Welling, John Wiley & Sons, 2021, p. 427-439Chapter in book (Refereed)
Abstract [en]

A magnetosphere may form around an object in a stellar wind either due to the intrinsic magnetic field of the object or stellar wind interaction with the ionosphere of the object. Comets represent the most variable magnetospheres in our solar system, and through the Rosetta mission we have had the chance to study the birth and evolution of a comet magnetosphere as the comet nucleus approached the Sun. We review the birth of the comet magnetosphere as observed at comet 67P Churyumov–Gerasimenko, the formation of plasma boundaries and how the solar wind–atmosphere interaction changes character as the cometary gas cloud and magnetosphere grow in size. Mass loading of the solar wind leads to an asymmetric deflection of the solar wind for low outgassing rates. With increasing activity a solar wind ion cavity forms. Intermittent shock‐like features were also observed. For intermediate outgassing rate a diamagnetic cavity is formed inside the solar wind ion cavity, thus well separated from the solar wind. The cometary plasma was typically very structured and variable. The region of the coma dense enough to have significant collisions forms a special region with different ion chemistry and plasma dynamics as compared to the outer collision‐free region.  

Place, publisher, year, edition, pages
John Wiley & Sons, 2021. p. 427-439
Series
Geophysical Monograph Series, ISSN 0065-8448
Keywords [en]
comet magnetosphere, comet nucleus, cometary plasma boundaries, electric fields, ion chemistry, plasma dynamics, Rosetta plasma observations, solar wind–atmosphere interaction
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Atmospheric Science
Identifiers
URN: urn:nbn:se:ltu:diva-84233DOI: 10.1002/9781119815624.ch27Scopus ID: 2-s2.0-85136031987OAI: oai:DiVA.org:ltu-84233DiVA, id: diva2:1553445
Note

ISBN för värdpublikation: 9781119507529, 9781119815624

Available from: 2021-05-10 Created: 2021-05-10 Last updated: 2024-08-15Bibliographically approved

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Nilsson, HansBehar, Etienne

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