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Ion acoustic waves ...
Ion acoustic waves at comet 67P/Churyumov-Gerasimenko : Observations and computations
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- Gunell, H. (author)
- Royal Belgian Inst Space Aeron BIRA IASB, Ave Circulaire 3, B-1180 Brussels, Belgium.
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- Nilsson, H. (author)
- Swedish Inst Space Phys, POB 812, S-98128 Kiruna, Sweden.
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- Hamrin, Maria (author)
- Umeå universitet,Institutionen för fysik,Umeå Univ, Dept Phys, S-90187 Umeå, Sweden.
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- Eriksson, Anders (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Odelstad, Elias (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Rymd- och plasmafysik
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- Maggiolo, R. (author)
- Royal Belgian Inst Space Aeron BIRA IASB, Ave Circulaire 3, B-1180 Brussels, Belgium.,Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
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- Henri, P. (author)
- CNRS, LPC2E, F-45071 Orleans, France.
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- Vallieres, X. (author)
- CNRS, LPC2E, F-45071 Orleans, France.
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- Altwegg, K. (author)
- Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
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- Tzou, C. -Y (author)
- Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
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- Rubin, M. (author)
- Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
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- Glassmeier, K. -H (author)
- Institut für Geophysik und extraterrestrische Physik, TU Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany
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- Wieser, G. Stenberg (author)
- Swedish Inst Space Phys, POB 812, S-98128 Kiruna, Sweden.
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- Wedlund, C. Simon (author)
- Univ Oslo, Dept Phys, Box 1048 Blindern, N-0316 Oslo, Norway.
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- De Keyser, J. (author)
- Royal Belgian Inst Space Aeron BIRA IASB, Ave Circulaire 3, B-1180 Brussels, Belgium.
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- Dhooghe, F. (author)
- Royal Belgian Inst Space Aeron BIRA IASB, Ave Circulaire 3, B-1180 Brussels, Belgium.
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- Cessateur, G. (author)
- Royal Belgian Inst Space Aeron BIRA IASB, Ave Circulaire 3, B-1180 Brussels, Belgium.
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- Gibbons, A. (author)
- Royal Belgian Inst Space Aeron BIRA IASB, Ave Circulaire 3, B-1180 Brussels, Belgium.;Univ Libre Bruxelles, Lab Chim Quant & Photophys, 50 Ave FD Roosevelt, B-1050 Brussels, Belgium.
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Royal Belgian Inst Space Aeron BIRA IASB, Ave Circulaire 3, B-1180 Brussels, Belgium Swedish Inst Space Phys, POB 812, S-98128 Kiruna, Sweden. (creator_code:org_t)
- 2017-03-17
- 2017
- English.
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In: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 600
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Abstract
Subject headings
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- Context. On 20 January 2015 the Rosetta spacecraft was at a heliocentric distance of 2.5 AU, accompanying comet 67P/Churyumov-Gerasimenko on its journey toward the Sun. The Ion Composition Analyser (RPC-ICA), other instruments of the Rosetta Plasma Consortium, and the ROSINA instrument made observations relevant to the generation of plasma waves in the cometary environment.Aims. Observations of plasma waves by the Rosetta Plasma Consortium Langmuir probe (RPC-LAP) can be explained by dispersion relations calculated based on measurements of ions by the Rosetta Plasma Consortium Ion Composition Analyser (RPC-ICA), and this gives insight into the relationship between plasma phenomena and the neutral coma, which is observed by the Comet Pressure Sensor of the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis instrument (ROSINA-COPS).Methods. We use the simple pole expansion technique to compute dispersion relations for waves on ion timescales based on the observed ion distribution functions. These dispersion relations are then compared to the waves that are observed. Data from the instruments RPC-LAP, RPC-ICA and the mutual impedance probe (RPC-MIP) are compared to find the best estimate of the plasma density.Results. We find that ion acoustic waves are present in the plasma at comet 67P/Churyumov-Gerasimenko, where the major ion species is H2O+. The bulk of the ion distribution is cold, k(B)T(i) = 0.01 eV when the ion acoustic waves are observed. At times when the neutral density is high, ions are heated through acceleration by the solar wind electric field and scattered in collisions with the neutrals. This process heats the ions to about 1 eV, which leads to significant damping of the ion acoustic waves.Conclusions. In conclusion, we show that ion acoustic waves appear in the H2O+ plasmas at comet 67P/Churyumov-Gerasimenko and how the interaction between the neutral and ion populations affects the wave properties.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- comets: general
- comets: individual: 67P/Churyumov-Gerasimenko
- instrumentation: detectors
- methods: analytical
- plasmas
- waves
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Gunell, H.
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Nilsson, H.
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Hamrin, Maria
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Eriksson, Anders
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Odelstad, Elias
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Maggiolo, R.
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Henri, P.
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Vallieres, X.
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Altwegg, K.
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Tzou, C. -Y
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Rubin, M.
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Glassmeier, K. - ...
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Wieser, G. Stenb ...
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Wedlund, C. Simo ...
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De Keyser, J.
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Dhooghe, F.
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Cessateur, G.
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Gibbons, A.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Astronomy and As ...
- By the university
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Royal Institute of Technology
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Umeå University
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Uppsala University