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Extremely Low-Frequency Waves Inside the Diamagnetic Cavity of Comet 67P/Churyumov-Gerasimenko
Univ Oslo, Dept Phys, Oslo, Norway;Tech Univ Denmark, Lyngby, Denmark.
Univ Oslo, Dept Phys, Oslo, Norway.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0003-2926-6761
Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Braunschweig, Germany.
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2018 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 45, no 9, p. 3854-3864Article in journal (Refereed) Published
Abstract [en]

The European Space Agency/Rosetta mission to comet 67P/Churyumov‐Gerasimenko has provided several hundred observations of the cometary diamagnetic cavity induced by the interaction between outgassed cometary particles, cometary ions, and the solar wind magnetic field. Here we present the first electric field measurements of four preperihelion and postperihelion cavity crossings on 28 May 2015 and 17 February 2016, using the dual‐probe electric field mode of the Langmuir probe (LAP) instrument of the Rosetta Plasma Consortium. We find that on large scales, variations in the electric field fluctuations capture the cavity and boundary regions observed in the already well‐studied magnetic field, suggesting the electric field mode of the LAP instrument as a reliable tool to image cavity crossings. In addition, the LAP electric field mode unravels for the first time extremely low‐frequency waves within two cavities. These low‐frequency electrostatic waves are likely triggered by lower‐hybrid waves observed in the surrounding magnetized plasma.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2018. Vol. 45, no 9, p. 3854-3864
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-357750DOI: 10.1029/2017GL076415ISI: 000434111700012OAI: oai:DiVA.org:uu-357750DiVA, id: diva2:1241131
Funder
The Research Council of Norway, 240000The Research Council of Norway, 230996Swedish National Space Board, 109/12Available from: 2018-08-22 Created: 2018-08-22 Last updated: 2018-08-22Bibliographically approved

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