CME impact on comet 67P/Churyumov-Gerasimenko
| Autor: | Charlotte Goetz, Hans Nilsson, Chris Carr, C. Simon Wedlund, Karl-Heinz Glassmeier, Markku Alho, Niklas J. T. Edberg, Christian Möstl, M. André, P. Henri, Emanuele Cupido, David Andrews, Etienne Behar, Anders Eriksson, Kathleen Mandt, F. L. Johansson, Christoph Koenders, Karoly Szego, G. Stenberg Wieser, Martin Volwerk, Elias Odelstad, E. Vigren, James L. Burch, I. A. D. Engelhardt, Raymond Goldstein, Ingo Richter |
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| Přispěvatelé: | Aalto University, Swedish Institute of Space Physics [Uppsala] (IRF), Space Science Division [San Antonio], Southwest Research Institute [San Antonio] (SwRI), Imperial College London, Blackett Laboratory, Institut für Geophysik und Extraterrestrische Physik [Braunschweig] (IGEP), Technische Universität Braunschweig = Technical University of Braunschweig [Braunschweig], Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), UTSA Department of Physics and Astronomy [San Antonio], The University of Texas at San Antonio (UTSA), Department of Physics [Oslo], Faculty of Mathematics and Natural Sciences [Oslo], University of Oslo (UiO)-University of Oslo (UiO), Wigner Research Centre for Physics [Budapest], Hungarian Academy of Sciences (MTA), Space Research Institute of Austrian Academy of Sciences (IWF), Austrian Academy of Sciences (OeAW), ANR-15-CE31-0009,SPECTRA,Sonder le Plasma dans l'Environnement d'une ComètE avec RosettA(2015), Swedish Institute of Space Physics, Department of Radio Science and Engineering, Southwest Research Institute, Technical University of Braunschweig, Laboratoire de Physique et Chimie de l’Environnement et de l’Espace, Austrian Academy of Sciences, University of Oslo, Wigner Research Centre for Physics, Aalto-yliopisto |
| Rok vydání: | 2016 |
| Předmět: |
VENUS IONOSPHERE
010504 meteorology & atmospheric sciences Sun: coronal mass ejections (CMEs) ROSETTA PLASMA CONSORTIUM education Comet FOS: Physical sciences Astrophysics Astronomy & Astrophysics 01 natural sciences SOLAR-WIND INTERACTION CORONAL MASS EJECTION Fusion plasma och rymdfysik Physics - Space Physics Comet nucleus 0103 physical sciences Coronal mass ejection Astrophysics::Solar and Stellar Astrophysics ION 010303 astronomy & astrophysics 0105 earth and related environmental sciences Physics ENVIRONMENT Science & Technology ta115 [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] MAGNETIC-FLUX ROPES comets: individual: 67P/Churyumov-Gerasimenko Astronomy Astronomy and Astrophysics Magnetic reconnection Plasma Fusion Plasma and Space Physics Space Physics (physics.space-ph) coronal mass ejections (CMEs) [Sun] Magnetic flux ELECTRON SENSOR Magnetic field 0201 Astronomical And Space Sciences Solar wind solar wind 13. Climate action Space and Planetary Science Physical Sciences Physics::Space Physics RPC Astrophysics::Earth and Planetary Astrophysics TAIL DISCONNECTION individual: 67P/Churyumov-Gerasimenko [comets] |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2016, 462 (Suppl 1), pp.S45-S56. ⟨10.1093/mnras/stw2112⟩ S46 S45 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stw2112 |
| Popis: | We present Rosetta observations from comet 67P/Churyumov-Gerasimenko during the impact of a coronal mass ejection (CME). The CME impacted on 5-6 Oct 2015, when Rosetta was about 800 km from the comet nucleus, \textcolor{black}{and 1.4 AU from the Sun}. Upon impact, the plasma environment is compressed to the level that solar wind ions, not seen a few days earlier when at 1500 km, now reach Rosetta. In response to the compression, the flux of suprathermal electrons increases by a factor of 5-10 and the background magnetic field strength increases by a factor of $\sim$2.5. The plasma density increases by a factor of 10 and reaches 600 cm$^{-3}$, due to increased particle impact ionisation, charge exchange and the adiabatic compression of the plasma environment. We also observe unprecedentedly large magnetic field spikes at 800 km, reaching above 200 nT, which are interpreted as magnetic flux ropes. We suggest that these could possibly be formed by magnetic reconnection processes in the coma as the magnetic field across the CME changes polarity, or as a consequence of strong shears causing Kelvin-Helmholtz instabilities in the plasma flow. Due to the \textcolor{black}{limited orbit of Rosetta}, we are not able to observe if a tail disconnection occurs during the CME impact, which could be expected based on previous remote observations of other CME-comet interactions. 14 pages, 12 figures |
| Databáze: | OpenAIRE |
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