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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260525T043448Z
UID:https://www.ipp.mpg.de/events/45024/5403304
DTSTART:20260312T093000Z
DTEND:20260312T110000Z
CLASS:PUBLIC
CREATED:20260310T074957Z
DESCRIPTION:Abstract: The Rayleigh–Taylor instability (RTI) is a key mech
 anism driving mixing and structure formation in magnetised astrophysical p
 lasmas. In many environments of the interstellar medium the gas is only pa
 rtially ionised\, so that ions and neutrals can drift relative to each oth
 er and exchange momentum through collisions. The linear behaviour of the m
 agnetised RTI in this regime has remained poorly characterised.In this tal
 k I present a two-fluid study of the magnetised RTI in partially ionised p
 lasmas. I first derive the linear dispersion relation including ion–neut
 ral collisional coupling. The analysis shows how the growth rate depends o
 n the collision frequency\, ionisation fraction and magnetic field orienta
 tion\, and recovers the ideal MHD and hydrodynamic limits.I then compare t
 hese predictions with high-resolution two-fluid simulations performed with
  the MPI-AMRVAC code. The numerical results reproduce the theoretical grow
 th rates over a wide range of coupling regimes.Finally\, I discuss the non
 linear evolution of the instability. The simulations show that ambipolar d
 iffusion redistributes part of the kinetic energy into ion–neutral drift
  and modifies the morphology of the mixing layer\, producing smoother inte
 rfaces and reduced small-scale structure compared to ideal MHD.\nVortragen
 de(r): Edouard Callies
LAST-MODIFIED:20260310T075156Z
LOCATION:IPP L7A\, Raum: 121
ORGANIZER;CN=Plasma Astrophysics group (TOK):mailto:artem.bohdan@ipp.mpg.de
SUMMARY:Rayleigh–Taylor instability in partially ionised plasmas: two-flu
 id linear theory and nonlinear ambipolar diffusion effects
URL;VALUE=URI:https://www.ipp.mpg.de/events/45024/5403304
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