[IGPP Everyone] TOMORROW: Plasma Seminar Wednesday 2/21: Parametric Decay Instability and Dissipation of Low-frequency Alfvén Waves in Low-beta Turbulent Plasmas (Sean Fu, Los Alamos)

[Emmanuel V. Masongsong]

Dear all- 

We have a plasma seminar this Wednesday, February 21st at 2PM in Room 
4-330 of the Physics & Astronomy Building (PAB). Coffee and cookies 
will be available in the room at 1:45. Our speaker is Dr. Sean Fu of 
the New Mexico Consortium (Los Alamos), and his title and abstract are 
as follows: 

"Parametric Decay Instability and Dissipation of Low-frequency Alfvén 
Waves in Low-beta Turbulent Plasmas" 

Evolution of the parametric decay instability (PDI) of a circularly 
polarized Aflvén wave in a turbulent low-beta plasma background is 
investigated using 3D hybrid simulations. It is shown that the 
turbulence reduces the growth rate of PDI as compared to the linear 
theory predictions, but PDI can still exist. Interestingly, the damping 
rate of ion acoustic mode (as the product of PDI) is also reduced as 
compared to the linear Vlasov predictions. Nonetheless, significant 
heating of ions in the direction parallel to the background magnetic 
field is observed due to resonant Landau damping of the ion acoustic 
waves. In low-beta turbulent plasmas, PDI can provide an important 
channel for energy dissipation of low-frequency Alfvén waves at a scale 
much larger than the ion kinetic scales, different from the traditional 
turbulence dissipation models. arXiv:1710.04149. 

http://www.pa.ucla.edu/sites/default/files/plasma_Fu22118.pdf 
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