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Return Currents in Collisionless Shocks
Siddhartha Gupta, Damiano Caprioli, Anatoly Spitkovsky
Collisionless shocks tend to send charged particles into the upstream, driving electric currents through the plasma. Using kinetic particle-in-cell simulations, we investigate how…
Safety first: Stability and dissipation of line-tied force-free flux tubes in magnetized coronae
Natalie Rugg, Jens F. Mahlmann, Anatoly Spitkovsky
Magnetized plasma columns and extended magnetic structures with both footpoints anchored to a surface layer are an important building block of astrophysical dissipation models. Cur…
Microphysics of Particle Reflection in Weibel-Mediated Shocks
Jasmine Parsons, Anatoly Spitkovsky, Arno Vanthieghem
Particle-in-cell (PIC) simulations have shown that relativistic collisionless shocks mediated by the Weibel instability accelerate about 1% of incoming particles, while the majorit…
Particle-in-cell simulations of pulsar magnetospheres: transition between electrosphere and force-free regimes
Fábio Cruz, Thomas Grismayer, Alexander Y. Chen +3
Global particle-in-cell (PIC) simulations of pulsar magnetospheres are performed with a volume, surface and pair production-based plasma injection schemes to systematically investi…
Particle-in-cell Simulations of the Magnetorotational Instability in Stratified Shearing Boxes
Astor Sandoval, Mario Riquelme, Anatoly Spitkovsky +1
The magnetorotational instability (MRI) plays a crucial role in regulating the accretion efficiency in astrophysical accretion disks. In low-luminosity disks around black holes, su…