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BEGIN:VEVENT
DTSTAMP:20260428T215943Z
DTSTART;VALUE=DATE-TIME:20260223T140000
DTEND;VALUE=DATE-TIME:20260223T150000
SUMMARY:Alban Pothérat (Centre for Fluid and Complex Systems\, Coventry U
 niversity): "Magnetohydrodynamic waves in liquid metals"
TZID:Europe/London
UID:20260223-8ac672c79c5163bb019c5309a9760c1b@warwick.ac.uk
CREATED:20260212T181036Z
DESCRIPTION:Magnetohydrodynamic waves play a central role in most geophys
 ical and astrophysical systems involving conducting fluids and magnetic 
 fields. For example\, in the solar corona\, they underpin the oscillator
 y behaviour of coronal loops. In the liquid core of the Earth\, their pr
 opagation from the solid inner core to the outer core-mantle boundary dr
 ives variations in the length of days. The journey to the formal underst
 anding of these waves started in 1942 with Alfvén's simple 1D\, theory f
 or a linear transversal MHD wave\, in a homogeneous\, incompressible flu
 id pervaded by a homogeneous magnetic field. In real systems\, however\,
  inhomogeneities\, nonlinearities\, background flows and multi-modality 
 are essential ingredients whose impact is difficult to study in isolatio
 n. Since Lundquist's fist attempt to produce Alfvén's waves (AW) in merc
 ury in 1949\, liquid metal experiments have been hindered by the large m
 agnetic dissipation inherent to metals. They struggled to produce even s
 imple linear waves and have been practically abandoned. The advent of pl
 asma Technology in the 1950's offered a more successful alternative\, wi
 th the first convincing experimental evidence of AW\, followed by more c
 omplex waves with inhomogeneities and nonlinear interactions. Plasma dev
 ices are\, however very complex and make it difficult to control flow co
 nditions. Furthermore\, the compressibility of plasmas make it difficult
  to disentangle the different types of waves they bear. In this talk\, I
  will show that well-controlled MHD waves can be generated in liquid met
 als after all\, by means of a technique previously used to produce MHD t
 urbulence. The idea relies on very high magnetic fields that enable MHD 
 waves to propagate before they dissipate\, and consists in forcing the w
 aves with electric current of adjustable distribution. With this techniq
 ue\, we obtain AW\, inhomogeneous waves\, and produce nonlinear interact
 ions between MHD waves in liquid metal for the first time. The vast poss
 ible variations around the principle of these experiments provide a new 
 alley to individually study complex aspects of MHD wave involving inhomo
 geneity\, nonlinearity\, but also background flows and other ingredients
  relevant to geo and astrophysical systems. S. Lalloz\, L. Davoust\, F. 
 Debray and A. Pothérat\, "Alfven waves at low magnetic Reynolds number: 
 transitions between diffusion\, dispersive Alfvén waves and nonlinear pr
 opagation"\, J. Fluid Mech. 1003\, A19 (2025)
LOCATION:PS0.17
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20260212T181036Z
ORGANIZER;CN=Dmitrii Kolotkov:
END:VEVENT
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