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Plasma source and l...
Plasma source and loss at comet 67P during the Rosetta mission
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- Heritier, K. L. (författare)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Galand, M. (författare)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Henri, P. (författare)
- Univ Orleans, CNRS, LPC2E, F-45100 Orleans, France
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- Johansson, Fredrik (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Beth, A. (författare)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Eriksson, Anders (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Vallieres, X. (författare)
- Univ Orleans, CNRS, LPC2E, F-45100 Orleans, France
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- Altwegg, K. (författare)
- Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland
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- Burch, J. L. (författare)
- Southwest Res Inst, PO Drawer 28510, San Antonio, TX 78228 USA
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- Carr, C. (författare)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England
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- Ducrot, E. (författare)
- Imperial Coll London, Dept Phys, Prince Consort Rd, London SW7 2AZ, England;Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, B-4000 Liege, Belgium
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- Hajra, R. (författare)
- Univ Orleans, CNRS, LPC2E, F-45100 Orleans, France
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- Rubin, M. (författare)
- Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland
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(creator_code:org_t)
- 2018-10-12
- 2018
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 618
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://www.aanda.or...
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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
- Context. The Rosetta spacecraft provided us with a unique opportunity to study comet 67P/Churyumov-Gerasimenko (67P) from a close perspective and over a 2-yr time period. Comet 67P is a weakly active comet. It was therefore unexpected to find an active and dynamic ionosphere where the cometary ions were largely dominant over the solar wind ions, even at large heliocentric distances. Aims. Our goal is to understand the different drivers of the cometary ionosphere and assess their variability over time and over the different conditions encountered by the comet during the Rosetta mission. Methods. We used a multi-instrument data-based ionospheric model to compute the total ion number density at the position of Rosetta. In-situ measurements from the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) and the Rosetta Plasma Consortium (RPC)-Ion and Electron Sensor (IES), together with the RPC-LAngmuir Probe instrument (LAP) were used to compute the local ion total number density. The results are compared to the electron densities measured by RPC-Mutual Impedance Probe (MIP) and RPC-LAP. Results. We were able to disentangle the physical processes responsible for the formation of the cometary ions throughout the 2-yr escort phase and we evaluated their respective magnitudes. The main processes are photo-ionization and electron-impact ionization. The latter is a significant source of ionization at large heliocentric distance (>2 au) and was predominant during the last 4 months of the mission. The ionosphere was occasionally subject to singular solar events, temporarily increasing the ambient energetic electron population. Solar photons were the main ionizer near perihelion at 1.3 au from the Sun, during summer 2015.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- comets: general
- plasmas
- space vehicles: instruments
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- ref (ämneskategori)
- art (ämneskategori)
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Heritier, K. L.
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Galand, M.
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Henri, P.
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Johansson, Fredr ...
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Beth, A.
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Eriksson, Anders
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visa fler...
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Vallieres, X.
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Altwegg, K.
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Burch, J. L.
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Carr, C.
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Ducrot, E.
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Hajra, R.
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Rubin, M.
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