Bulletin of the American Physical Society
63rd Annual Meeting of the APS Division of Plasma Physics
Volume 66, Number 13
Monday–Friday, November 8–12, 2021; Pittsburgh, PA
Session BM10: Mini-Conference: Collisionless Shocks in Laboratory and Space Plasmas I
9:30 AM–12:30 PM,
Monday, November 8, 2021
Room: Room 406
Chair: Nikolai Pogorelov, University of Alabama, Huntersville
Abstract: BM10.00003 : Strongly magnetized parallel collisionless shocks in pair plasmas*
10:10 AM–10:30 AM
Abstract 
Presenter:
Antoine Bret
(Univ de Castilla-La Mancha)
Authors:
Antoine Bret
(Univ de Castilla-La Mancha)
Colby C Haggerty
(University of Hawaii)
Damiano Caprioli
(University of Chicago)
*Collisionless shock waves are frequently treated/modeled as a collisional, fluid MHD discontinuity. In light of this, using PIC simulations of non-relativistic, parallel collisionless shocks, we detail the deviation of collisionless shocks form MHD predictions for varying magnetization/Alfvénic Mach numbers. We show that for sufficiently large upstream magnetic fields, the shock compression ratio is dramatically reduced, in agreement with the predictions of Bret & Narayan 2018. Additionally, we examine the role of field strength on the shock width and on the generation of energetic particles. This work reinforces a growing body of work that suggest that modeling many astrophysical systems with only a fluid plasma description omits potentially important physics.
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