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  • Henri, P.CNRS, LPC2E, F-45071 Orleans, France;CNRS, LPC2E, 3A Ave Rech Sci, F-45071 Orleans, France (author)

Diamagnetic region(s) : structure of the unmagnetized plasma around Comet 67P/CG

  • Article/chapterEnglish2017

Publisher, publication year, extent ...

  • 2017-06-21
  • OXFORD UNIV PRESS,2017
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-376691
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-376691URI
  • https://doi.org/10.1093/mnras/stx1540DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • The ESA's comet chaser Rosetta has monitored the evolution of the ionized atmosphere of comet 67P/Churyumov-Gerasimenko (67P/CG) and its interaction with the solar wind, during more than 2 yr. Around perihelion, while the cometary outgassing rate was highest, Rosetta crossed hundreds of unmagnetized regions, but did not seem to have crossed a large-scale diamagnetic cavity as anticipated. Using in situ Rosetta observations, we characterize the structure of the unmagnetized plasma found around comet 67P/CG. Plasma density measurements from RPC-MIP are analysed in the unmagnetized regions identified with RPC-MAG. The plasma observations are discussed in the context of the cometary escaping neutral atmosphere, observed by ROSINA/COPS. The plasma density in the different diamagnetic regions crossed by Rosetta ranges from similar to 100 to similar to 1500 cm(-3). They exhibit a remarkably systematic behaviour that essentially depends on the comet activity and the cometary ionosphere expansion. An effective total ionization frequency is obtained from in situ observations during the high outgassing activity phase of comet 67P/CG. Although several diamagnetic regions have been crossed over a large range of distances to the comet nucleus (from 50 to 400 km) and to the Sun (1.25-2.4 au), in situ observations give strong evidence for a single diamagnetic region, located close to the electron exobase. Moreover, the observations are consistent with an unstable contact surface that can locally extend up to about 10 times the electron exobase.

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  • Vallieres, X.CNRS, LPC2E, F-45071 Orleans, France (author)
  • Hajra, R.CNRS, LPC2E, F-45071 Orleans, France (author)
  • Goetz, C.TU Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany (author)
  • Richter, I.TU Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany (author)
  • Glassmeier, K. -H (author)
  • Galand, M.Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England (author)
  • Rubin, M.Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland (author)
  • Eriksson, Anders I.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)andeerik (author)
  • Nemeth, Z.Wigner Res Ctr Phys, Budapest, Hungary (author)
  • Vigren, ErikUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)erivi300 (author)
  • Beth, A.Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England (author)
  • Burch, J. L.Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA (author)
  • Carr, C.Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England (author)
  • Nilsson, H.Swedish Inst Space Phys, POB 812, SE-98128 Kiruna, Sweden (author)
  • Tsurutani, B.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91125 USA (author)
  • Wattieaux, G.Univ Toulouse, CNRS, LAPLACE, F-31062 Toulouse, France (author)
  • CNRS, LPC2E, F-45071 Orleans, France;CNRS, LPC2E, 3A Ave Rech Sci, F-45071 Orleans, FranceCNRS, LPC2E, F-45071 Orleans, France (creator_code:org_t)

Related titles

  • In:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS469, s. S372-S3790035-87111365-2966

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