[IGPP Everyone] Tomorrow: Plasma Seminar Thursday 10/8, 2pm: Charged-particle propagation in the interstellar medium (M. Weidl, Max Planck Institute)

[Emmanuel V. Masongsong]

Dear all, 

We have a plasma seminar this Thursday, October 8th 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. Martin Weidl of the 
Max-Planck-Institut für Plasmaphysik, and his title and abstract are as 
follows: 

"Charged-particle propagation in the interstellar medium" 

In turbulent astrophysical systems, velocity fluctuations and 
magnetic-field fluctuations are often correlated. In the solar wind or 
in the interstellar medium, this implies that more or stronger Alfvén 
waves propagate opposite to the magnetic mean field than along it. This 
imbalance, known as 'cross helicity', has a dramatic influence on the 
heating and scattering of charged particles. 

In order to investigate its effect, we have performed test-particle 
simulations of strongly cross-helical MHD turbulence. We study whether 
quasilinear predictions of the heating rate of charged particles are 
valid under realistic conditions, and compare quasilinear pitch-angle 
diffusion coefficients with test-particle scattering after one 
gyroperiod. Moreover, we elucidate the role of the magnetic moment for 
pitch-angle scattering on short timescales. 

http://www.pa.ucla.edu/sites/default/files/plasma_%20Weidl10815.pdf 


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