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First detection of a diamagnetic cavity at comet 67P/Churyumov-Gerasimenko

Goetz, C. (author)
Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
Koenders, C. (author)
Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
Richter, I. (author)
Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
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Altwegg, K. (author)
Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
Burch, J. (author)
Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA.
Carr, C. (author)
Univ London Imperial Coll Sci Technol & Med, Space & Atmospher Phys Grp, Exhibit Rd, London SW7 2AZ, England.
Cupido, E. (author)
Univ London Imperial Coll Sci Technol & Med, Space & Atmospher Phys Grp, Exhibit Rd, London SW7 2AZ, England.
Eriksson, Anders (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Guettler, C. (author)
Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Henri, P. (author)
Univ Orleans, CNRS, Lab Phys & Chim Environm & Espace, UMR 7328, F-45100 Orleans, France.
Mokashi, P. (author)
Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA.
Nemeth, Z. (author)
Wigner Res Ctr Phys, Konkoly Thege Miklos Ut 29-33, H-1121 Budapest, Hungary.
Nilsson, H. (author)
Swedish Inst Space Phys, POB 812, S-98128 Kiruna, Sweden.
Rubin, M. (author)
Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
Sierks, H. (author)
Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Tsurutani, B. (author)
CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA.
Vallat, C. (author)
European Space Astron Ctr, Madrid 28691, Spain.
Volwerk, M. (author)
Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria.
Glassmeier, K. -H (author)
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Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland. (creator_code:org_t)
2016-03-11
2016
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 588
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Context. The Rosetta magnetometer RPC-MAG has been exploring the plasma environment of comet 67P/Churyumov-Gerasimenko since August 2014. The first months were dominated by low-frequency waves which evolved into more complex features. However, at the end of July 2015, close to perihelion, the magnetometer detected a region that did not contain any magnetic field at all. Aims. These signatures match the appearance of a diamagnetic cavity as was observed at comet 1P/Halley in 1986. The cavity here is more extended than previously predicted by models and features unusual magnetic field configurations, which need to be explained. Methods. The onboard magnetometer data were analyzed in detail and used to estimate the outgassing rate. A minimum variance analysis was used to determine boundary normals. Results. Our analysis of the data acquired by the Rosetta Plasma Consortium instrumentation confirms the existence of a diamagnetic cavity. The size is larger than predicted by simulations, however. One possible explanation are instabilities that are propagating along the cavity boundary and possibly a low magnetic pressure in the solar wind. This conclusion is supported by a change in sign of the Sun-pointing component of the magnetic field. Evidence also indicates that the cavity boundary is moving with variable velocities ranging from 230 500m/s.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

comets: individual: 67P/Churyumov-Gerasimenko
plasmas
magnetic fields
methods: data analysis

Publication and Content Type

ref (subject category)
art (subject category)

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