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Investigating short-time-scale variations in cometary ions around comet 67P
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2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 469, p. S522-S534Article in journal (Refereed) Published
Abstract [en]

The highly varying plasma environment around comet 67P/Churyumov-Gerasimenko inspired an upgrade of the ion mass spectrometer (Rosetta Plasma Consortium Ion Composition Analyzer) with new operation modes, to enable high time resolution measurements of cometary ions. Two modes were implemented, one having a 4 s time resolution in the energy range 0.3-82 eV/q and the other featuring a 1 s time resolution in the energy range 13-50 eV/q. Comparing measurements made with the two modes, it was concluded that 4 s time resolution is enough to capture most of the fast changes of the cometary ion environment. The 1462 h of observations done with the 4 s mode were divided into hour-long sequences. It is possible to sort 84 per cent of these sequences into one of five categories, depending on their appearance in an energy-time spectrogram. The ion environment is generally highly dynamic, and variations in ion fluxes and energies are seen on time-scales of 10 s to several minutes.

Place, publisher, year, edition, pages
Oxford University Press, 2017. Vol. 469, p. S522-S534
Keywords [en]
plasmas, instrumentation: detectors, methods: data analysis, methods: statistical, space vehicles: instruments, comets: individual: 67P
National Category
Fusion, Plasma and Space Physics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:umu:diva-153854DOI: 10.1093/mnras/stx2133ISI: 000443940500049OAI: oai:DiVA.org:umu-153854DiVA, id: diva2:1268359
Conference
International Conference on Cometary Science - Comets - A New Vision after Rosetta and Philae, NOV 14-18, 2016, Toulouse, FRANCE
Funder
Swedish National Space Board, 96/15Swedish National Space Board, 101/15Swedish National Space Board, 95/15Available from: 2018-12-05 Created: 2018-12-05 Last updated: 2018-12-05Bibliographically approved

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Gunell, Herbert

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Odelstad, EliasNilsson, HansEriksson, Anders I.Gunell, Herbert
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Monthly notices of the Royal Astronomical Society
Fusion, Plasma and Space PhysicsAstronomy, Astrophysics and Cosmology

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