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Cometary plasma res...
Cometary plasma response to interplanetary corotating interaction regions during 2016 June-September : a quantitative study by the Rosetta Plasma Consortium
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- Hajra, Rajkumar (författare)
- CNRS, LPC2E, F-45071 Orleans, France
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- Henri, Pierre (författare)
- CNRS, LPC2E, F-45071 Orleans, France
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- Myllys, Minna (författare)
- CNRS, LPC2E, F-45071 Orleans, France
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- Heritier, Kevin L. (författare)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Galand, Marina (författare)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Wedlund, Cyril Simon (författare)
- Univ Oslo, Dept Phys, Box 1048 Blindern, N-0316 Oslo, Norway
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- Breuillard, Hugo (författare)
- CNRS, LPC2E, F-45071 Orleans, France;Sorbonne Univ, CNRS, Ecole Polytech, Lab Phys Plasmas, 4 Pl Jussieu, F-75252 Paris, France
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- Behar, Etienne (författare)
- Swedish Inst Space Phys, POB 812, SE-98128 Kiruna, Sweden
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- Edberg, Niklas J. T. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Goetz, Charlotte (författare)
- TU Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany
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- Nilsson, Hans (författare)
- Swedish Inst Space Phys, POB 812, SE-98128 Kiruna, Sweden
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- Eriksson, Anders I. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Goldstein, Raymond (författare)
- Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA
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- Tsurutani, Bruce T. (författare)
- CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
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- More, Jerome (författare)
- CNRS, LPC2E, F-45071 Orleans, France
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- Vallieres, Xavier (författare)
- CNRS, LPC2E, F-45071 Orleans, France
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- Wattieauxu, Gaetan (författare)
- Univ Toulouse, CNRS, LAPLACE, F-31062 Toulouse, France
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(creator_code:org_t)
- 2018-08-09
- 2018
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 480:4, s. 4544-4556
- Relaterad länk:
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https://hal-insu.arc...
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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
- 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 similar to 3-3.8 au. The CIRs, formed in the interface region between low- and high-speed solar wind streams with speeds of similar to 320-400 km s(-1) and similar to 580-640 km s(-1), respectively, are characterized by relative increases in solar wind proton density by factors of similar to 13-29, in proton temperature by similar to 7-29, and in magnetic field by similar to 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 similar to 5-92 per cent of the magnetosonic speed at angles of similar to 20 degrees-87 degrees relative to ambient magnetic field. Only one is identified to be a quasi-parallel forward shock with magnetosonic Mach number of similar to 1.48 and shock normal angle of similar to 41 degrees. The cometary ionosphere response was monitored by Rosetta from cometocentric distances of similar to 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 similar to 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.
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
- methods: data analysis
- methods: observational
- Sun: rotation
- solar wind
- comets: general
- comets: individual: 67P/Churyumov-Gerasimenko
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Hajra, Rajkumar
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Henri, Pierre
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Myllys, Minna
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Heritier, Kevin ...
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Galand, Marina
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Wedlund, Cyril S ...
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Breuillard, Hugo
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Behar, Etienne
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Edberg, Niklas J ...
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Goetz, Charlotte
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Nilsson, Hans
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Eriksson, Anders ...
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Goldstein, Raymo ...
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Tsurutani, Bruce ...
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More, Jerome
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Vallieres, Xavie ...
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Wattieauxu, Gaet ...
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