magnetic fields;
MHD;
plasmas;
turbulence;
SOLAR-WIND;
CURRENT SHEETS;
LOW-FREQUENCY;
DRIVEN;
SIMULATIONS;
WEAK;
D O I:
10.1093/mnras/stx611
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
In magnetohydrodynamic (MHD) turbulence, the large-scale magnetic field sets a preferred local direction for the small-scale dynamics, altering the statistics of turbulence from the isotropic case. This happens even in the absence of a total magnetic flux, since MHD turbulence forms randomly oriented large-scale domains of strong magnetic field. It is therefore customary to study small-scale magnetic plasma turbulence by assuming a strong background magnetic field relative to the turbulent fluctuations. This is done, for example, in reduced models of plasmas, such as reduced MHD, reduced-dimension kinetic models, gyrokinetics, etc., which make theoretical calculations easier and numerical computations cheaper. Recently, however, it has become clear that the turbulent energy dissipation is concentrated in the regions of strong magnetic field variations. A significant fraction of the energy dissipation may be localized in very small volumes corresponding to the boundaries between strongly magnetized domains. In these regions, the reduced models are not applicable. This has important implications for studies of particle heating and acceleration in magnetic plasma turbulence. The goal of this work is to systematically investigate the relationship between local magnetic field variations and magnetic energy dissipation, and to understand its implications for modelling energy dissipation in realistic turbulent plasmas.
机构:
Univ St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Univ Sao Paulo, Escola Artes Ciencias & Humanidades, BR-03828000 Sao Paulo, BrazilUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Falceta-Goncalves, D.
Bonnell, I.
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机构:
Univ St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, ScotlandUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Bonnell, I.
Kowal, G.
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h-index: 0
机构:
Univ Sao Paulo, Escola Artes Ciencias & Humanidades, BR-03828000 Sao Paulo, BrazilUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Kowal, G.
Lepine, J. R. D.
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h-index: 0
机构:
Univ Sao Paulo, Inst Astron Geofis & Cincias Atmosfer, BR-05508090 Sao Paulo, BrazilUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Lepine, J. R. D.
Braga, C. A. S.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Sao Paulo, Inst Astron Geofis & Cincias Atmosfer, BR-05508090 Sao Paulo, BrazilUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
机构:
Inter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, India
Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08540 USA
Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08540 USAInter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, India
Bhat, Pallavi
Subramanian, Kandaswamy
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h-index: 0
机构:
Inter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, IndiaInter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, India
Subramanian, Kandaswamy
Brandenburg, Axel
论文数: 0引用数: 0
h-index: 0
机构:
KTH Royal Inst Technol, Nordita, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden
Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden
Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, SE-10691 Stockholm, Sweden
Univ Colorado, JILA, Boulder, CO 80303 USA
Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA
Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USAInter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, India
机构:
Univ St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Univ Sao Paulo, Escola Artes Ciencias & Humanidades, BR-03828000 Sao Paulo, BrazilUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Falceta-Goncalves, D.
Bonnell, I.
论文数: 0引用数: 0
h-index: 0
机构:
Univ St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, ScotlandUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Bonnell, I.
Kowal, G.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Sao Paulo, Escola Artes Ciencias & Humanidades, BR-03828000 Sao Paulo, BrazilUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Kowal, G.
Lepine, J. R. D.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Sao Paulo, Inst Astron Geofis & Cincias Atmosfer, BR-05508090 Sao Paulo, BrazilUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Lepine, J. R. D.
Braga, C. A. S.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Sao Paulo, Inst Astron Geofis & Cincias Atmosfer, BR-05508090 Sao Paulo, BrazilUniv St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
机构:
Inter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, India
Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08540 USA
Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08540 USAInter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, India
Bhat, Pallavi
Subramanian, Kandaswamy
论文数: 0引用数: 0
h-index: 0
机构:
Inter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, IndiaInter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, India
Subramanian, Kandaswamy
Brandenburg, Axel
论文数: 0引用数: 0
h-index: 0
机构:
KTH Royal Inst Technol, Nordita, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden
Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden
Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, SE-10691 Stockholm, Sweden
Univ Colorado, JILA, Boulder, CO 80303 USA
Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA
Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USAInter Univ Ctr Astron & Astrophys, Post Bag 4,Pune Univ Campus, Pune 411007, Maharashtra, India