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Ion Acceleration Ef...
Ion Acceleration Efficiency at the Earth's Bow Shock : Observations and Simulation Results
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- Johlander, Andreas, 1990- (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Univ Helsinki, Dept Phys, Helsinki, Finland
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- Battarbee, M. (author)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Vaivads, Andris (author)
- KTH,Rymd- och plasmafysik,KTH Royal Inst Technol, Space & Plasma Phys, Stockholm, Sweden
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- Turc, L. (author)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Pfau-Kempf, Y. (author)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Ganse, U. (author)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Grandin, M. (author)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Dubart, M. (author)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Khotyaintsev, Yu. V. (author)
- Swedish Inst Space Phys, Uppsala, Sweden.
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- Caprioli, D. (author)
- Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 USA.
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- Haggerty, C. (author)
- Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 USA.
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- Schwartz, S. J. (author)
- Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA.
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- Giles, B. L. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Palmroth, M. (author)
- Univ Helsinki, Dept Phys, Helsinki, Finland.;Finnish Meteorol Inst, Space & Earth Observat Ctr, Helsinki, Finland.
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- Khotyaintsev, Yuri V. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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(creator_code:org_t)
- 2021-06-17
- 2021
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 914:2
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
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- Collisionless shocks are some of the most efficient particle accelerators in heliospheric and astrophysical plasmas. Here we study and quantify ion acceleration at Earth's bow shock with observations from NASA's Magnetospheric Multiscale (MMS) satellites and in a global hybrid-Vlasov simulation. From the MMS observations, we find that quasiparallel shocks are more efficient at accelerating ions. There, up to 15% of the available energy goes into accelerating ions above 10 times their initial energy. Above a shock-normal angle of similar to 50 degrees, essentially no energetic ions are observed downstream of the shock. We find that ion acceleration efficiency is significantly lower when the shock has a low Mach number (M ( A ) < 6) while there is little Mach number dependence for higher values. We also find that ion acceleration is lower on the flanks of the bow shock than at the subsolar point regardless of the Mach number. The observations show that a higher connection time of an upstream field line leads to somewhat higher acceleration efficiency. To complement the observations, we perform a global hybrid-Vlasov simulation with realistic solar-wind parameters with the shape and size of the bow shock. We find that the ion acceleration efficiency in the simulation shows good quantitative agreement with the MMS observations. With the combined approach of direct spacecraft observations, we quantify ion acceleration in a wide range of shock angles and Mach numbers.
Subject headings
- 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)
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- ref (subject category)
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- By the author/editor
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Johlander, Andre ...
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Battarbee, M.
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Vaivads, Andris
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Turc, L.
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Pfau-Kempf, Y.
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Ganse, U.
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Grandin, M.
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Dubart, M.
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Khotyaintsev, Yu ...
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Caprioli, D.
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Haggerty, C.
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Schwartz, S. J.
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Giles, B. L.
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Palmroth, M.
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Khotyaintsev, Yu ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astrophysical Jo ...
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Royal Institute of Technology
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Uppsala University