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SUMMARY:Shock substructure in partially-ionised plasma - Ben Snow (Exeter)
DTSTART:20190429T130000Z
DTEND:20190429T140000Z
UID:TALK120874@talks.cam.ac.uk
CONTACT:Dr William Béthune
DESCRIPTION:The partially-ionised nature of the lower solar atmosphere int
 roduces new and exciting complexities to shock solutions. Here we study nu
 merically the slow-mode shock triggered via a magnetic discontinuity\, mim
 icking the slow-mode shocks that can form as a result of magnetic reconnec
 tion. In single-fluid ideal MHD\, the slow-mode shock occurs as a disconti
 nuous jump in parameters. However\, in the two-fluid partially-ionised pla
 sma\, the shock occupies a finite width due to the coupling and decoupling
  of plasma and neutral species across the shock. It is found that this fin
 ite width region allows for shock substructure that can affect the overall
  dynamics of the system. In particular\, we find that an intermediate shoc
 k can exist where the plasma velocity transitions from super to sub Alfven
 ic velocities. A key feature of this type of shock is that the magnetic fi
 eld is reversed across the interface. We present numerical results analysi
 ng the formation and evolution of intermediate shocks as substructure with
 in slow-mode shocks.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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