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Spatial distribution of low-energy plasma around comet 67P/CG from Rosetta measurements
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, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, no 11, 4263-4269 p.Article in journal (Refereed) Published
Abstract [en]

We use measurements from the Rosetta plasma consortium Langmuir probe and mutual impedance probe to study the spatial distribution of low-energy plasma in the near-nucleus coma of comet 67P/Churyumov-Gerasimenko. The spatial distribution is highly structured with the highest density in the summer hemisphere and above the region connecting the two main lobes of the comet, i.e., the neck region. There is a clear correlation with the neutral density and the plasma to neutral density ratio is found to be approximate to 1-210(-6), at a cometocentric distance of 10km and at 3.1AU from the Sun. A clear 6.2h modulation of the plasma is seen as the neck is exposed twice per rotation. The electron density of the collisionless plasma within 260km from the nucleus falls off with radial distance as approximate to 1/r. The spatial structure indicates that local ionization of neutral gas is the dominant source of low-energy plasma around the comet.

Place, publisher, year, edition, pages
2015. Vol. 42, no 11, 4263-4269 p.
Keyword [en]
comet, Rosetta, plasma, RPC, ionosphere
National Category
Geophysics Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-260139DOI: 10.1002/2015GL064233ISI: 000357511200003OAI: oai:DiVA.org:uu-260139DiVA: diva2:846741
Available from: 2015-08-18 Created: 2015-08-17 Last updated: 2017-12-04Bibliographically approved

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Edberg, Niklas J. T.Eriksson, Anders I.Odelstad, EliasAndré, MatsGill, ReineJohansson, Erik P. G.Johansson, FredrikVigren, ErikWahlund, Jan-Erik

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Edberg, Niklas J. T.Eriksson, Anders I.Odelstad, EliasAndré, MatsGill, ReineJohansson, Erik P. G.Johansson, FredrikVigren, ErikWahlund, Jan-Erik
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Swedish Institute of Space Physics, Uppsala Division
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Geophysical Research Letters
GeophysicsFusion, Plasma and Space Physics

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