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SUMMARY:The role of reconnection in magnetized turbulence
DTSTART:20190117T143000
DTEND:20190117T153000
DTSTAMP:20260916T010200Z
UID:0389524f777b72965d6b0ae13bfd4ee6a8f751283881169616859fc4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Nuno F.G. Loureiro\nDept. of Nuclear Science and Enginee
 ring\nTheory and Modeling Division – Plasma Science and Fusion Center\nM
 IT\, Boston\, USA\nMagnetic reconnection has long been hypothesized to be 
 a key ingredient of magnetized plasma turbulence\, but a theory of how it 
 might occur had been lacking. Recent analytical works [Loureiro17a\, Malle
 t17a\, Boldyrev17] have revisited the current understanding of Alfvénic t
 urbulence\, concluding that reconnection must inevitably become important 
 in the inertial range\, at the scale where it becomes faster than the eddy
  turn over time. This is predicted to lead to a transition to a new sub-in
 ertial interval\, suggesting a route to energy dissipation that is fundame
 ntally different from that envisioned in the usual Kolmogorov-like phenome
 nology.\n\nThese concepts can be extended to weakly collisional plasmas\, 
 where reconnection is enabled by electron inertia rather than resistivity 
 [Loureiro17b\, Mallet17b]. Although several different cases must then be c
 onsidered (whether the eddies themselves are on MHD or kinetic scales\, wh
 ether the plasma beta is large or small\, etc.)\, a common result to all o
 f them is that the energy spectrum exhibits a scaling with the perpendicul
 ar wave number that scales between $k_\\perp^{−8/3}$ and $k_\\perp^{−3
 }$\, in favorable agreement with observations and numerical studies.\n\nTh
 ese results have since found support in direct numerical simulations [Walk
 er18\, Dong18] and observations of solar wind turbulence [Vech18]. This ta
 lk aims to review these results\, and discuss their implications.\n\nRefer
 ences:\n\n[Boldyrev17] S. Boldyrev and N.F. Loureiro\, Astrophys. J. 844\,
  125 (2017)\n[Dong18] C. Dong\, L. Wang\, Y.-M. Huang\, et al.\, Phys. Rev
 . Lett. 121\, 165101 (2018)\n[Loureiro17a] N.F. Loureiro and S. Boldyrev\,
  Phys. Rev. Lett. 118\, 245101 (2017)\n[Loureiro17b] N.F. Loureiro and S. 
 Boldyrev\, Astrophys. J. 850\, 182 (2017)\n[Mallet17a] A. Mallet\, A. A. S
 chekochihin and B.D.G. Chandran\, Mon. Not. R. Astron. Soc. 468\, 4862 (20
 17)\n[Mallet17b] A. Mallet\, A. A. Schekochihin and B.D.G. Chandran\, J. P
 lasma Phys. 83\, 905830609 (2017)\n[Vech18] D. Vech\, A. Mallet\, K. G. Kl
 ein\, et al.\, Astrophysics. J. Lett. 855\, L27 (2018)\n[Walker18] J. Walk
 er\, S. Boldyrev\, N. F. Loureiro\, Phys. Rev. E 98\, 033209 (2018)
LOCATION:PPB 019 https://plan.epfl.ch/?room=PPB019
STATUS:CONFIRMED
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