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Vertical structure of the near-surface expanding ionosphere of comet 67P probed by Rosetta
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- Heritier, K. L. (author)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Henri, P. (author)
- Univ Orleans, CNRS, LPC2E, F-45100 Orleans, France
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- Vallieres, X. (author)
- Univ Orleans, CNRS, LPC2E, F-45100 Orleans, France
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- Galand, M. (author)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Odelstad, Elias (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Inst Space Phys, Box 537, SE-75121 Uppsala, Sweden.
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- Eriksson, Anders I. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen
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- Johansson, F. L. (author)
- Swedish Inst Space Phys, Angstrom Lab, Lagerhyddsvagen 1, SE-75237 Uppsala, Sweden
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- Altwegg, K. (author)
- Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland
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- Behar, E. (author)
- Swedish Inst Space Phys, POB 812, SE-98128 Kiruna, Sweden
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- Beth, A. (author)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Broiles, T. W. (author)
- Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA
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- Burch, J. L. (author)
- Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA
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- Carr, C. M. (author)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Cupido, E. (author)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Nilsson, H. (author)
- Swedish Inst Space Phys, POB 812, SE-98128 Kiruna, Sweden
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- Rubin, M. (author)
- Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland
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- Vigren, Erik (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen
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(creator_code:org_t)
- 2017-06-12
- 2017
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 469, s. S118-S129
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https://boris.unibe....
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https://urn.kb.se/re...
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Abstract
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- The plasma environment has been measured for the first time near the surface of a comet. This unique data set has been acquired at 67P/Churyumov-Gerasimenko during ESA/Rosetta spacecraft's final descent on 2016 September 30. The heliocentric distance was 3.8 au and the comet was weakly outgassing. Electron density was continuously measured with Rosetta Plasma Consortium (RPC)-Mutual Impedance Probe (MIP) and RPC-LAngmuir Probe (LAP) during the descent from a cometocentric distance of 20 km down to the surface. Data set from both instruments have been cross-calibrated for redundancy and accuracy. To analyse this data set, we have developed a model driven by Rosetta Orbiter Spectrometer for Ion and Neutral Analysis-COmetary Pressure Sensor total neutral density. The two ionization sources considered are solar extreme ultraviolet radiation and energetic electrons. The latter are estimated from the RPC-Ion and Electron Sensor (IES) and corrected for the spacecraft potential probed by RPC-LAP. We have compared the results of the model to the electron densities measured by RPC-MIP and RPC-LAP at the location of the spacecraft. We find good agreement between observed and modelled electron densities. The energetic electrons have access to the surface of the nucleus and contribute as the main ionization source. As predicted, the measurements exhibit a peak in the ionospheric density close to the surface. The location and magnitude of the peak are estimated analytically. The measured ionospheric densities cannot be explained with a constant outflow velocity model. The use of a neutral model with an expanding outflow is critical to explain the plasma observations.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- plasmas
- methods: data analysis
- Sun: UV radiation
- comets: individual: 67P
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Heritier, K. L.
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Henri, P.
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Vallieres, X.
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Galand, M.
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Odelstad, Elias
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Eriksson, Anders ...
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show more...
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Johansson, F. L.
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Altwegg, K.
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Behar, E.
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Beth, A.
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Broiles, T. W.
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Burch, J. L.
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Carr, C. M.
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Cupido, E.
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Nilsson, H.
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Rubin, M.
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Vigren, Erik
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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NATURAL SCIENCES
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and Fusion Plasma an ...
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Royal Institute of Technology
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Uppsala University