Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session JI01: Astrophysical/Space Plasmas I
2:00 PM–5:00 PM,
Tuesday, October 18, 2022
Room: Ballroom 100 A
Chair: Maxim Lyutikov, Purdue Univ.
Abstract: JI01.00006 : Thomas H. Stix Award for Outstanding Early Career Contributions to Plasma Physics Research: Weakly Collisional Heating and Turbulence in Astrophysical Plasmas*
4:30 PM–5:00 PM
Presenter:
Jonathan Squire
(University of Otago)
Author:
Jonathan Squire
(University of Otago)
In this talk, I will outline some of the entertaining challenges that are involved in the study of weakly collisional plasma turbulence and heating. While 3-D kinetic simulations are becoming increasingly feasible, their key strength – realistically capturing plasma dynamics – is also a weakness, with their complexity sometimes hiding important basic physics principles. Reduced models, such as gyro- and drift-kinetics, therefore enable important progress by revealing conservation laws or other principles that govern the dynamics. Using such models as a foundation, I will discuss some surprising and nontrivial behaviors that occur in different regimes, such as collisionless plasmas that create their own collisionality, and turbulent cascades that become “stuck” at intermediate scales, halting heating entirely. The landscape of weakly collisional turbulent physics across different regimes is only partially explored, and many interesting challenges remain in understanding the role of plasma kinetics in astrophysics.
*Work supported by the Royal Society Te Apārangi RDF-U001804 and other awards
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