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Solar Wind Protons ...
Solar Wind Protons Forming Partial Ring Distributions at Comet 67P
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- Möslinger, Anja (författare)
- Umeå universitet,Institutionen för fysik,Swedish Institute of Space Physics, Kiruna, Sweden,Swedish Inst Space Phys, Kiruna, Sweden.;Umeå Univ, Dept Phys, Umeå, Sweden.
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- Wieser, G. Stenberg (författare)
- Swedish Inst Space Phys, Kiruna, Sweden.,Swedish Institute of Space Physics, Kiruna, Sweden
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- Nilsson, H. (författare)
- Swedish Inst Space Phys, Kiruna, Sweden.,Swedish Institute of Space Physics, Kiruna, Sweden
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- Gunell, Herbert (författare)
- Umeå universitet,Institutionen för fysik,Umeå Univ, Dept Phys, Umeå, Sweden.
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- Williamson, H. N. (författare)
- Swedish Inst Space Phys, Kiruna, Sweden.
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- LLera, K. (författare)
- Southwest Res Inst, San Antonio, TX USA.,Southwest Research Institute, TX, San Antonio, United States
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- Odelstad, Elias (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Institute of Space Physics, Uppsala, Sweden
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- Richter, I. (författare)
- Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Braunschweig, Germany.,Institut für Geophysik und Extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
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(creator_code:org_t)
- American Geophysical Union (AGU), 2023
- 2023
- Engelska.
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Ingår i: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 128:2
- 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://umu.diva-por... (primary) (Raw object)
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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
Ämnesord
Stäng
- We present partial ring distributions of solar wind protons observed by the Rosetta spacecraft at comet 67P/Churyumov-Gerasimenko. The formation of ring distributions is usually associated with high activity comets, where the spatial scales are larger than multiple ion gyroradii. Our observations are made at a low-activity comet at a heliocentric distance of 2.8 AU on 19 April 2016, and the partial rings occur at a spatial scale comparable to the ion gyroradius. We use a new visualization method to simultaneously show the angular distribution of median energy and differential flux. A fitting procedure extracts the bulk speed of the solar wind protons, separated into components parallel and perpendicular to the gyration plane, as well as the gyration velocity. The results are compared with models and put into context of the global comet environment. We find that the formation mechanism of these partial rings of solar wind protons is entirely different from the well-known partial rings of cometary pickup ions at high-activity comets. A density enhancement layer of solar wind protons around the comet is a focal point for proton trajectories originating from different regions of the upstream solar wind. If the spacecraft location coincides with this density enhancement layer, the different trajectories are observed as an energy-angle dispersion and manifest as partial rings in velocity space.
Ämnesord
- 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)
Nyckelord
- 6025
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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