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Events on Monday, February 10th, 2025

Atomic Physics Seminar
Title to be announced
Time: 11:00 am - 12:00 pm
Place: 5310 Chamberlin
Speaker: Dr. Josiah Sinclair, MIT
Host: Mark Saffman
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Plasma Physics (Physics/ECE/NE 922) Seminar
"Chemical mixing by stratified MHD turbulence in stars"
Time: 12:00 pm - 1:15 pm
Place: 1227 Engineering Hall
Speaker: Adrian Fraser, University of Colorado - Boulder
Abstract: 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 (DDC), which regulates heat and salinity transport in many parts of the ocean. I will discuss how analogous conditions in stellar interiors also drive DDC, which may regulate the transport of different chemical species between the envelopes and cores of a broad range of stars. There, 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 model for predicting this mixing efficiency, and discuss ongoing efforts to check whether MHD DDC indeed solves any stellar chemical mixing problems.
Host: Prof. Adelle Wright
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Plasma Theory Seminar
Journal Club
“Non-ideal instabilities in sinusoidal shear flows with a streamwise magnetic field”
Time: 4:00 pm - 5:00 pm
Place: 514 Engineering Research Bldg
Speaker: Adrian Fraser, University of Colorado - Boulder
Abstract:
Host: Prof. Adelle Wright
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