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Mass-loading, pile-up, and mirror-mode waves at comet 67P/Churyumov-Gerasimenko
Austrian Acad Sci, Space Res Inst, A-8010 Graz, Austria..
TU Braunschweig, Inst Geophys & Extraterrestrial Phys, Braunschweig, Germany..
CALTECH, Pasadena, CA USA..
TU Braunschweig, Inst Geophys & Extraterrestrial Phys, Braunschweig, Germany..
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2016 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 34, no 1, 1-15 p.Article in journal (Refereed) Published
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Text
Abstract [en]

The data from all Rosetta plasma consortium instruments and from the ROSINA COPS instrument are used to study the interaction of the solar wind with the outgassing cometary nucleus of 67P/Churyumov-Gerasimenko. During 6 and 7 June 2015, the interaction was first dominated by an increase in the solar wind dynamic pressure, caused by a higher solar wind ion density. This pressure compressed the draped magnetic field around the comet, and the increase in solar wind electrons enhanced the ionization of the outflow gas through collisional ionization. The new ions are picked up by the solar wind magnetic field, and create a ring/ring-beam distribution, which, in a high-beta plasma, is unstable for mirror mode wave generation. Two different kinds of mirror modes are observed: one of small size generated by locally ionized water and one of large size generated by ionization and pick-up farther away from the comet.

Place, publisher, year, edition, pages
2016. Vol. 34, no 1, 1-15 p.
Keyword [en]
Space plasma physics, charged particle motion and acceleration, nonlinear phenomena, waves and instabilities
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-296792DOI: 10.5194/angeo-34-1-2016ISI: 000373596900001OAI: oai:DiVA.org:uu-296792DiVA: diva2:939895
Funder
Swedish National Space BoardSwedish Research Council
Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2017-11-28Bibliographically approved

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Edberg, Niklas. J. T.Eriksson, Anders

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