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Cold ion energizati...
Cold ion energization at separatrices during magnetic reconnection
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- Zaitsev, I. (författare)
- St Petersburg State Univ, Dept Earths Phys, St Petersburg 198504, Russia.
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- Divin, A. (författare)
- St Petersburg State Univ, Dept Earths Phys, St Petersburg 198504, Russia.
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- Semenov, V. (författare)
- St Petersburg State Univ, Dept Earths Phys, St Petersburg 198504, Russia.
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- Kubyshkin, I. (författare)
- St Petersburg State Univ, Dept Earths Phys, St Petersburg 198504, Russia.
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- Korovinskiy, D. (författare)
- Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria.
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- Deca, J. (författare)
- Univ Colorado, Lab Atmospher & Space Phys LASP, Boulder, CO 80303 USA.;NASA, Inst Modeling Plasma Atmospheres & Cosm Dust, SSERVI, Moffett Field, CA 94035 USA.;Univ Versailles St Quentin, Lab Atmospheres Milieux Observat Spatiales LATMOS, F-78280 Guyancourt, France.
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- Khotyaintsev, Yu. (författare)
- Swedish Inst Space Phys, Box 537, SE-75121 Uppsala, Sweden.
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- Markidis, Stefano (författare)
- KTH,Beräkningsvetenskap och beräkningsteknik (CST),KTH Royal Inst Technol, SE-10044 Stockholm, Sweden.
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- Khotyaintsev, Yuri V. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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St Petersburg State Univ, Dept Earths Phys, St Petersburg 198504, Russia Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria. (creator_code:org_t)
- AIP Publishing, 2021
- 2021
- Engelska.
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Ingår i: Physics of Plasmas. - : AIP Publishing. - 1070-664X .- 1089-7674. ; 28:3
- Relaterad länk:
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https://doi.org/10.1...
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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
- Separatrices of magnetic reconnection host intense perpendicular Hall electric fields. The fields are produced by the decoupling of the ion and electron components and are associated with the in-plane electrostatic potential drop between the inflow and outflow regions. The width of these structures is typically less than the ion inertial length, which is small enough to demagnetize ions as they cross the layer. We investigate ion acceleration at separatrices by means of 2D particle-in-cell simulations of magnetic reconnection for two limiting cases: (1) a "GEM-like" setup (here GEM stands for geospace environmental modeling reconnection challenge) with the lobe ion thermal velocity equal to the thermal velocity of the initial current sheet ions, which is comparable to the Alfven velocity and (2) a "cold" ion setup, in which the temperature of the background lobe ions is 1/100 of the initial current sheet temperature. The separatrix Hall electric field is balanced by the ion inertia term in the cold background simulations. The effect is indicative of the quasi-steady local perpendicular acceleration. The electric field introduces a cross field beam of unmagnetized particles, which makes the ion distribution function strongly non-gyrotropic and susceptible to sub-ion scale instabilities. This acceleration mechanism nearly vanishes in the hot ion background simulations. Our particle-in-cell simulations are complemented by one-dimensional test particle calculations. They show that the hot ion particles experience energy-scattering after crossing the accelerating layer, whereas cold ions are uniformly energized up to the energies comparable to the electrostatic potential drop between the inflow and outflow regions.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
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