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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3282
DTSTART:20140213T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260315T145205Z
LAST-MODIFIED:20140205T190256Z
LOCATION:4421 Sterling Hall
SUMMARY:Asymmetries in Protoplanetary Transition Disks\, Astronomy Col
 loquium\, Hui Li\, Los Alamos National Laboratory
DESCRIPTION:Particle energization in astrophysical systems is a challe
 nging yet fascinating subject. Observations from radio to gamma-rays o
 f AGN jets\, supernova remnants\, pulsars\, gamma-ray bursts\, etc.\, 
 have provided important clues. In this talk\, we explore the energy co
 nversion processes in a parameter regime when the magnetic energy dens
 ity overwhelms the particle energy density (including its rest mass en
 ergy density). Such a condition has been discussed in the context of A
 GN jets and pulsars.  We present two-dimensional and three-dimensional
  relativistic\, full kinetic simulations that show fast magnetic recon
 nection can occur in highly magnetized plasmas\, with the magnetizatio
 n parameter ranging from unity to 1600. The fast magnetic dissipation 
 leads to a fast\, nonthermal particle acceleration\, yielding a power 
 law distribution with a hard spectrum.  Detailed analyses show that th
 e acceleration in the power-law range is mainly by a Fermi-like mechan
 ism in the relativistic flows generated by reconnection. Implications 
 for observations will be discussed. 
URL:https://www.physics.wisc.edu/events/?id=3282
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