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BEGIN:VEVENT
DTSTAMP:20260428T195510Z
DTSTART;VALUE=DATE-TIME:20190312T100000
DTEND;VALUE=DATE-TIME:20190312T110000
SUMMARY:Norbert Magyar (KU Leuven): Uniturbulence\, a new type of MHD tur
 bulence
TZID:Europe/London
UID:20190312-8a1785d868bd6a9a0168c7666de55639@warwick.ac.uk
CREATED:20190304T131454Z
DESCRIPTION:Abstract: The current understanding of the MHD turbulence gen
 eration mechanism originated in the works of Iroshnikov (1963) and Kraic
 hnan (1965) (IK for short)\, and is based on the Alfvén effect: the nonl
 inear cascade of energy\, essential in turbulence\, is the result of suc
 cessive collisions between counter-propagating Alfvén waves along the me
 an magnetic field. This theory is still at the basis of current models i
 n MHD turbulence. However\, this approach is strictly valid only in inco
 mpressible and homogeneous (and infinite) plasma\, under which condition
 s the only existing wave type is that of purely magnetically-driven Alfv
 én waves. Allowing for compressibility introduces a much richer spectrum
  of MHD waves\, especially if the plasma inhomogeneity is also accounted
  for. Recently\, using full 3D MHD numerical modelling of the propagatio
 n of Alfvénic waves in a plasma inhomogeneous in the perpendicular direc
 tion\, Magyar et al. (2017) showed that due to the modified nature of th
 e MHD waves in inhomogeneous plasmas\, characterised by linear coupling 
 of incompressive and compressive perturbations\, the Elsässer variables 
 usually representing the up and down-propagating pure Alfvén waves along
  a mean magnetic field are both nonzero even for unidirectionally propag
 ating waves. This leads to the same nonlinear advection term in the MHD 
 equations being nonzero as in the IK phenomenology\, but now for the wav
 es propagating only in one direction. We name this new turbulence genera
 tion mechanism in inhomogeneous plasmas uniturbulence\, stemming from th
 e unidirectional wave cascade. Plasmas which are permeated mostly by wav
 es propagating in one direction include coronal holes and the solar wind
 \, thus these are expected to be the most influenced by the uniturbulenc
 e. This finding constitutes a paradigm shift in our understanding of the
  MHD turbulence as a whole\, opening up a new alley in turbulence studie
 s. Most excitingly\, it might be relevant to the decades-long unsolved p
 roblem of coronal heating\, especially in open magnetic field regions.
LOCATION:PS017
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20190304T131454Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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