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SEQUENCE:0
UID:UW-Physics-Event-6163
DTSTART:20201008T203000Z
DTEND:20201008T220000Z
DTSTAMP:20260415T010432Z
LAST-MODIFIED:20201005T132030Z
LOCATION:Zoom meeting(see Abstract ) Coffee and tea 3:30pm\, Talk 3:45
 pm
SUMMARY:Particle acceleration by pressure anisotropy plasma instabilit
 ies: from black hole accretion disks to solar flares.\, Astronomy Coll
 oquium\, Mario Riquelme\, University of Chile
DESCRIPTION:Pressure anisotropies naturally arise in weakly collisiona
 l plasmas\, and are ultimately limited by the pitch-angle scattering p
 rovided by various kinetic plasma instabilities. I will present partic
 le-in-cell (PIC) plasma simulations of these instabilities\, and will 
 show that\, in some regimes\, their scattering can be highly inelastic
  and produce significant nonthermal particle acceleration. The present
 ation will focus on two astrophysical plasma environments: i) sub-rela
 tivistic\, weakly collisional accretion disks around black holes (e.g.
 \, Sgr A*)\, where both electron and ion acceleration will be consider
 ed\, and ii) non-relativistic\, low beta plasmas relevant for solar fl
 ares\, where the case of electron acceleration will be analyzed. I wil
 l review the main evidence for the existence of particle acceleration 
 in these systems\, and will discuss the importance that pressure aniso
 tropy instabilities can have in helping explain these fascinating acce
 leration phenomena. <br>
\n<br>
\nZoom Information<br>
\nhttps://us02w
 eb.zoom.us/j/88513896776?pwd=Y1JtRE1KZllxWkFTamJBSGtGdm9yQT09<br>
\n <
 br>
\n            Meeting ID: 885 1389 6776<br>
\n<br>
\n            P
 asscode: 713070
URL:https://www.physics.wisc.edu/events/?id=6163
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