Cometary plasma response to interplanetary corotating interaction regions during 2016 June-September: A quantitative study by the Rosetta Plasma Consortium
| Autor: | Hans Nilsson, Anders Eriksson, Bruce T. Tsurutani, K. L. Heritier, Etienne Behar, Charlotte Goetz, Minna Myllys, Rajkumar Hajra, Marina Galand, Raymond Goldstein, Pierre Henri, Jérôme Moré, Xavier Vallières, Hugo Breuillard, Niklas J. T. Edberg, Gaëtan Wattieaux, Cyril Simon Wedlund |
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| Přispěvatelé: | 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), Imperial College London, Department of Physics [Imperial College London], University of Oslo (UiO), Laboratoire de Physique des Plasmas (LPP), Université Paris-Saclay-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École polytechnique (X)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Swedish Institute of Space Physics [Kiruna] (IRF), Swedish Institute of Space Physics [Uppsala] (IRF), Technische Universität Braunschweig = Technical University of Braunschweig [Braunschweig], Southwest Research Institute [San Antonio] (SwRI), Jet Propulsion Laboratory (JPL), California Institute of Technology (CALTECH)-NASA, Plasmas Réactifs Hors Equilibre (LAPLACE-PRHE), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Science and Technology Facilities Council (STFC), European Space Agency / Estec |
| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
Comet Astrophysics Astronomy & Astrophysics 01 natural sciences SOLAR-WIND INTERACTION AE INDEX Ionization 0103 physical sciences HIGH-INTENSITY ION 010303 astronomy & astrophysics Sun: rotation 0105 earth and related environmental sciences Physics comets: individual: 67P/Churyumov–Gerasimenko Science & Technology 67P IONOSPHERE [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] comets: general MAGNETIC-FIELD comets: individual: 67P/Churyumov-Gerasimenko LONG-DURATION Astronomy and Astrophysics Plasma methods: data analysis [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph] 0201 Astronomical And Space Sciences Solar wind solar wind ELECTRON-CONTENT 13. Climate action Space and Planetary Science Physical Sciences RPC Solar rotation Ionosphere methods: observational Longitude Interplanetary spaceflight |
| 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, 2018, 480 (4), pp.4544-4556. ⟨10.1093/mnras/sty2166⟩ |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.1093/mnras/sty2166⟩ |
| Popis: | International audience; Four interplanetary corotating interaction regions (CIRs) were identified during 2016 June–September by the Rosetta Plasma Consortium (RPC) monitoring in situ the plasma environment of the comet 67P/Churyumov–Gerasimenko (67P) at heliocentric distances of ∼3–3.8 au. The CIRs, formed in the interface region between low- and high-speed solar wind streams with speeds of ∼320–400 km s−1 and ∼580–640 km s−1, respectively, are characterized by relative increases in solar wind proton density by factors of ∼13–29, in proton temperature by ∼7–29, and in magnetic field by ∼1–4 with respect to the pre-CIR values. The CIR boundaries are well defined with interplanetary discontinuities. Out of 10 discontinuities, four are determined to be forward waves and five are reverse waves, propagating at ∼5–92 per cent of the magnetosonic speed at angles of ∼20°–87° relative to ambient magnetic field. Only one is identified to be a quasi-parallel forward shock with magnetosonic Mach number of ∼1.48 and shock normal angle of ∼41°. The cometary ionosphere response was monitored by Rosetta from cometocentric distances of ∼4–30 km. A quiet time plasma density map was developed by considering dependences on cometary latitude, longitude, and cometocentric distance of Rosetta observations before and after each of the CIR intervals. The CIRs lead to plasma density enhancements of ∼500–1000 per cent with respect to the quiet time reference level. Ionospheric modelling shows that increased ionization rate due to enhanced ionizing (>12–200 eV) electron impact is the prime cause of the large cometary plasma density enhancements during the CIRs. Plausible origin mechanisms of the cometary ionizing electron enhancements are discussed. |
| Databáze: | OpenAIRE |
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