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Dynamic unmagnetize...
Dynamic unmagnetized plasma in the diamagnetic cavity around comet 67P/Churyumov-Gerasimenko
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- Hajra, Rajkumar (author)
- CNRS, LPC2E, F-45071 Orleans, France
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- Henri, Pierre (author)
- CNRS, LPC2E, F-45071 Orleans, France
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- Vallières, Xavier (author)
- CNRS, LPC2E, F-45071 Orleans, France
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- More, Jeromé (author)
- CNRS, LPC2E, F-45071 Orleans, France
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- Gilet, Nicolas (author)
- CNRS, LPC2E, F-45071 Orleans, France
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- Wattieaux, Gaetan (author)
- Univ Toulouse, LAPLACE, CNRS, F-31062 Toulouse, France
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- Goetz, Charlotte (author)
- TU Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany
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- Richter, Ingo (author)
- TU Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany
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- Tsurutani, Bruce T. (author)
- CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
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- Gunell, Herbert (author)
- Umeå universitet,Institutionen för fysik,Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Avenue Circulaire 3, B-1180 Brussels, Belgium,Royal Belgian Inst Space Aeron BIRA IASB, Ave Circulaire 3, B-1180 Brussels, Belgium;Umea Univ, Dept Phys, SE-90187 Umea, Sweden
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- Nilsson, Hans (author)
- Swedish Inst Space Phys, POB 812, SE-98128 Kiruna, Sweden
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- Eriksson, Anders (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Nemeth, Zoltan (author)
- Wigner Res Ctr Phys, Konkoly Thege M Rd 29-33, Budapest, Hungary
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- Burchdegrees, James L. (author)
- Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA
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- Rubin, Martin (author)
- Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland
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(creator_code:org_t)
- 2018-01-12
- 2018
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 475:3, s. 4140-4147
- Related links:
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https://boris.unibe....
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- The Rosetta orbiter witnessed several hundred diamagnetic cavity crossings (unmagnetized regions) around comet 67P/Churyumov-Gerasimenko during its two year survey of the comet. The characteristics of the plasma environment inside these diamagnetic regions are studied using in situ measurements by the Rosetta Plasma Consortium instruments. Although the unmagnetized plasma density has been observed to exhibit little dynamics compared to the very dynamical magnetized cometary plasma, we detected several localized dynamic plasma structures inside those diamagnetic regions. These plasma structures are not related to the direct ionization of local cometary neutrals. The structures are found to be steepened, asymmetric plasma enhancements with typical rising-to-descending slope ratio of similar to 2.8 (+/- 1.9), skewness similar to 0.43 (+/- 0.36), mean duration of similar to 2.7 (+/- 0.9) min and relative density variation Delta N/N of similar to 0.5 (+/- 0.2), observed close to the electron exobase. Similar steepened plasma density enhancements were detected at the magnetized boundaries of the diamagnetic cavity as well as outside the diamagnetic region. The plausible scalelength and propagation direction of the structures are estimated from simple plasma dynamics considerations. It is suggested that they are large-scale unmagnetized plasma enhancements, transmitted from the very dynamical outer magnetized region to the inner magnetic field-free cavity region.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- methods: data analysis
- methods: observational
- comets: general
- comets: individual: P/Churyumov-Gerasimenko
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Hajra, Rajkumar
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Henri, Pierre
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Vallières, Xavie ...
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More, Jeromé
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Gilet, Nicolas
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Wattieaux, Gaeta ...
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show more...
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Goetz, Charlotte
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Richter, Ingo
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Tsurutani, Bruce ...
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Gunell, Herbert
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Nilsson, Hans
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Eriksson, Anders
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Nemeth, Zoltan
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Burchdegrees, Ja ...
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Rubin, Martin
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
- Articles in the publication
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Monthly notices ...
- By the university
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Umeå University
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Uppsala University