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Plasma waves confined to the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Avenue Circulaire 3, B-1180 Brussels, Belgium.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 469, s. S84-S92Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Ion acoustic waves were observed in the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko by the Rosetta spacecraft on 2015 August 3, when the comet was 1.25 au from the Sun. Wave spectra recorded by the Langmuir probe (RPC-LAP), peak near 200 Hz, decrease for higher frequencies and reach the noise floor at approximately 1.5 kHz. These waves were observed only when the spacecraft was in the diamagnetic cavity or at its boundary, which is identified as a sharp drop in magnetic field magnitude, measured by RPC-MAG. The plasma, on both sides of the boundary, is dominated by a cold (a few hundred K) water group ion population, one cold (k(B)T(e) similar to 0.1 eV) and one warm (k(B)T(e) similar to 10 eV) electron population. The observations are interpreted in terms of current-driven ion acoustic waves, generated by currents that flow through bulges on the boundary of the diamagnetic cavity.

sted, utgiver, år, opplag, sider
Oxford University Press, 2017. Vol. 469, s. S84-S92
Emneord [en]
plasmas, waves, methods: analytic, methods: data analysis, comets: individual: 67P/Churyumov-Gerasimenko
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Identifikatorer
URN: urn:nbn:se:umu:diva-153852DOI: 10.1093/mnras/stx1134ISI: 000443940500009OAI: oai:DiVA.org:umu-153852DiVA, id: diva2:1268346
Konferanse
International Conference on Cometary Science - Comets - A New Vision after Rosetta and Philae, NOV 14-18, 2016, Toulouse, FRANCE
Forskningsfinansiär
Swedish National Space BoardTilgjengelig fra: 2018-12-05 Laget: 2018-12-05 Sist oppdatert: 2018-12-05bibliografisk kontrollert

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