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BEGIN:VEVENT
DTSTAMP:20260403T194459Z
DTSTART;VALUE=DATE-TIME:20231024T150000
DTEND;VALUE=DATE-TIME:20231024T160000
SUMMARY:Harley Kelly (Imperial): Magnetopause Surface Waves in MHD Simula
 tions
TZID:Europe/London
UID:20231024-8a1785d78b141968018b19743485299c@warwick.ac.uk
CREATED:20231023T095751Z
DESCRIPTION:Earth’s magnetic field and the solar wind interact in such a 
 manner that a cavity around the planet known as the magnetosphere forms.
  The magnetosphere is not a perfect shield from the solar wind\; energy 
 and momentum can be passed between the two systems at their interface - 
 the magnetopause. The solar wind energy circulation throughout Earth’s m
 agnetosphere leads to many technologically disruptive phenomena\, collec
 tively known as space weather. Understanding this energy source is vital
  for space weather impact mitigation and prediction. One example of how 
 this energy and momentum transfer occurs is via the Kelvin-Helmholtz Ins
 tability (KHI). The KHI plays a significant role in the viscous-like mas
 s\, momentum\, and energy transfer from the solar wind into the magnetos
 phere through its intrinsically coupled vortical and wave dynamics. Thes
 e dynamics have both direct and indirect influences throughout magnetosp
 heric regions (such as the radiation belts\, auroral zones\, and ionosph
 ere) and provide different pathways for solar wind energy circulation th
 roughout geospace. Since sparse in situ measurements cannot resolve this
  global problem\, we employ a novel global 3D magnetohydrodynamic (MHD) 
 simulation called Gorgon to confidently study and compare the effects of
  these dynamics\, as only global simulations can reproduce the KHI in a 
 representative magnetospheric environment. In this talk\, I aim to cover
  how a KHI vortex is formally defined and reliably identified using loca
 l pressure-minima to derive a novel vortex identification technique know
 n as 𝜆𝑀𝐻𝐷. This technique leads to an investigation into how plasma 
 inhomogeneity\, compressibility\, and magnetic tension influence the for
 mation of an MHD vortex. Furthering this work\, the spatial-temporal amb
 iguity associated with KHI-generated magnetopause surface waves (MSWs) i
 s explored using a factorisation and dimensionality reduction technique 
 known as Dynamic Mode Decomposition (DMD). Analysis using this technique
  reveals dominant MSW frequencies and their spatial dependences and domi
 nances. Furthermore\, it indicates that discrete frequency MSWs have a f
 inite extent along the boundary and a superposition of modes is present 
 showing the KHI both generates and advects MSWs and vortices. The analys
 is also reveals MSW effects on the magnetosphere: MSWs drive magnetoshea
 th waves which cause bow shock motion\; the KHI is present along the hig
 h-latitude magnetopause in the noon-midnight meridian\; and MSWs are sho
 wn to be linked to plasma sheet waves. I conclude by discussing how this
  approach improves our understanding of MSWs energy transfer.
LOCATION:P5.23
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20231023T095751Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
END:VCALENDAR