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Unusually high magn...
Unusually high magnetic fields in the coma of 67P/Churyumov-Gerasimenko during its high-activity phase
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- Goetz, C. (författare)
- Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany
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- Tsurutani, B. T. (författare)
- Jet Prop Lab, Pasadena, CA USA
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- Henri, P. (författare)
- CNRS, LPC2E, Orleans, France
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- Volwerk, M. (författare)
- Austrian Acad Sci, Inst Weltraumforsch, Schmiedlstr 6, Graz, Austria
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- Behar, E. (författare)
- Swedish Inst Space Phys, POB 812, S-98128 Kiruna, Sweden
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- Edberg, Niklas J. T. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Eriksson, Anders (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Goldstein, R. (författare)
- Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA
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- Mokashi, P. (författare)
- Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA
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- Nilsson, H. (författare)
- Austrian Acad Sci, Inst Weltraumforsch, Schmiedlstr 6, Graz, Austria
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- Richter, I (författare)
- Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany
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- Wellbrock, A. (författare)
- UCL Dept Space & Climate Phys, Mullard Space Sci Lab, Dorking, Surrey, England
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- Glassmeier, K. H. (författare)
- Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany
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(creator_code:org_t)
- 2019-09-20
- 2019
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 630
- Relaterad länk:
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- comets: individual: 67P/Churyumov-Gerasimenko
- plasmas
- magnetic fields
- methods: data analysis
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Goetz, C.
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Tsurutani, B. T.
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Henri, P.
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Volwerk, M.
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Behar, E.
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Edberg, Niklas J ...
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visa fler...
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Eriksson, Anders
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Goldstein, R.
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Mokashi, P.
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Nilsson, H.
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Richter, I
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Wellbrock, A.
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Glassmeier, K. H ...
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visa färre...
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