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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-9065
DTSTART:20250210T180000Z
DTEND:20250210T191500Z
DTSTAMP:20260413T151419Z
LAST-MODIFIED:20250128T171101Z
LOCATION:1227 Engineering Hall
SUMMARY:"Chemical mixing by stratified MHD turbulence in stars"\, Plas
 ma Physics (Physics/ECE/NE 922) Seminar\, Adrian Fraser\, University o
 f Colorado - Boulder
DESCRIPTION:In tropical regions of the Atlantic Ocean\, the sun heats 
 and evaporates water off the ocean’s surface\, leaving water that’
 s hotter and saltier than deeper layers. While these gradients don’t
  drive overturning convection or Rayleigh-Taylor instabilities\, they 
 do drive a form of turbulence known as Double-Diffusive Convection (DD
 C)\, which regulates heat and salinity transport in many parts of the 
 ocean. I will discuss how analogous conditions in stellar interiors al
 so drive DDC\, which may regulate the transport of different chemical 
 species between the envelopes and cores of a broad range of stars. The
 re\, stellar magnetic fields can have an enormous impact on the nature
  and efficiency of this mixing and may resolve a decades-long tension 
 over whether observed mixing signatures are indeed explained by DDC. I
  will present a suite of MHD simulations that informed our reduced mod
 el for predicting this mixing efficiency\, and discuss ongoing efforts
  to check whether MHD DDC indeed solves any stellar chemical mixing pr
 oblems.
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URL:https://www.physics.wisc.edu/events/?id=9065
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