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Observations of high-plasma density region in the inner coma of 67P/Churyumov-Gerasimenko during early activity

Yang, Lei (författare)
Paulsson, J. J. P. (författare)
Wedlund, C. Simon (författare)
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Odelstad, Elias (författare)
Edberg, Niklas J. T. (författare)
Koenders, C. (författare)
Eriksson, Anders I. (författare)
Miloch, W. J. (författare)
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 (utgivare)
2016
2016
Engelska.
Ingår i: Monthly notices of the Royal Astronomical Society. - 0035-8711. ; 462, S33-S44
  • swepub:Mat__t
Abstract Ämnesord
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  • One of the primary objectives of the Rosetta Plasma Consortium, a suite of five plasma instruments on-board the Rosetta spacecraft, is to observe the formation and evolution of plasma interaction regions at the comet 67P/Churyumov-Gerasimenko (67P/CG). Observations made between 2015 April and 2016 February show that solar wind-cometary plasma interaction boundaries and regions formed around 2015 mid-April and lasted through early 2016 January. At least two regions were observed, separated by an ion-neutral collisionopause boundary. The inner region was located on the nucleus side of the boundary and was characterized by low-energy water-group ions, reduced magnetic field pileup and enhanced electron densities. The outer region was located outside of the boundary and was characterized by reduced electron densities, water-group ions that are accelerated to energies above 100 eV and enhanced magnetic field pileup compared to the inner region. The boundary discussed here is outside of the diamagnetic cavity and shows characteristics similar to observations made on-board the Giotto spacecraft in the ion pileup region at 1P/Halley. We find that the boundary is likely to be related to ion-neutral collisions and that its location is influenced by variability in the neutral density and the solar wind dynamic pressure.

Ämnesord

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

Nyckelord

plasmas
solar wind
comets: general

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art (ämneskategori)

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