Astronomy Unusually high magnetic fields in the coma of 67P/Churyumov-Gerasimenko during its high-activity phase
| العنوان: | Astronomy Unusually high magnetic fields in the coma of 67P/Churyumov-Gerasimenko during its high-activity phase |
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| المؤلفون: | Anne Wellbrock, Niklas J. T. Edberg, Raymond Goldstein, Etienne Behar, Prachet Mokashi, Bruce T. Tsurutani, P. Henri, Karl-Heinz Glassmeier, Martin Volwerk, Ingo Richter, Anders Eriksson, C. Goetz, Hans Nilsson |
| المساهمون: | Service de Biophysique et Médecine Nucléaire, CHU Strasbourg-Université Louis Pasteur - Strasbourg I-Hôpital de Hautepierre [Strasbourg], Jet Propulsion Laboratory (JPL), California Institute of Technology (CALTECH)-NASA, 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), Space Research Institute of Austrian Academy of Sciences (IWF), Austrian Academy of Sciences (OeAW), IFP Energies nouvelles (IFPEN), Swedish Institute of Space Physics [Uppsala] (IRF), Swedish Institute of Space Physics [Kiruna] (IRF), Space Sciences Laboratory [Berkeley] (SSL), University of California [Berkeley], University of California-University of California, Mullard Space Science Laboratory (MSSL), University College of London [London] (UCL), Institut für Geophysik und Extraterrestrische Physik [Braunschweig] (IGEP), Technische Universität Braunschweig = Technical University of Braunschweig [Braunschweig], Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Centre National d’Études Spatiales [Paris] (CNES), Technische Universität Braunschweig [Braunschweig] |
| المصدر: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 630, pp.A38. ⟨10.1051/0004-6361/201833544⟩ |
| بيانات النشر: | HAL CCSD, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Physics, 010504 meteorology & atmospheric sciences, Magnetic field magnitude, [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], Comet, Phase (waves), [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Astronomy and Astrophysics, Coma (optics), Plasma, Astrophysics, 01 natural sciences, Magnetic field, 13. Climate action, Space and Planetary Science, 0103 physical sciences, Physics::Space Physics, High activity, Astrophysics::Earth and Planetary Astrophysics, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences |
| الوصف: | Aims. On July 3, 2015, an unprecedented increase in the magnetic field magnitude was measured by the Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko (67P). This increase was accompanied by large variations in magnetic field and ion and electron density and energy. To our knowledge, this unusual event marks the highest magnetic field ever measured in the plasma environment of a comet. Our goal here is to examine possible physical causes for this event, and to explain this reaction of the cometary plasma and magnetic field and its trigger. Methods. We used observations from the entire Rosetta Plasma Consortium as well as energetic particle measurements from the Standard Radiation Monitor on board Rosetta to characterize the event. To provide context for the solar wind at the comet, observations at Earth were compared with simulations of the solar wind. Results. We find that the unusual behavior of the plasma around 67P is of solar wind origin and is caused by the impact of an interplanetary coronal mass ejection, combined with a corotating interaction region. This causes the magnetic field to pile up and increase by a factor of six to about 300 nT compared to normal values of the enhanced magnetic field at a comet. This increase is only partially accompanied by an increase in plasma density and energy, indicating that the magnetic field is connected to different regions of the coma. |
| اللغة: | English |
| تدمد: | 0004-6361 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dc0c042d2d6e95a250f87cd15e3ab6b0 https://hal.archives-ouvertes.fr/hal-02401155/file/aa33544-18.pdf |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....dc0c042d2d6e95a250f87cd15e3ab6b0 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00046361 |
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