I will report on recent advances in our understanding of stability, transport, and magnetic-field amplification in weakly collisional magnetized plasmas, such as the intracluster medium of galaxy clusters. These include: (1) the linear properties of the magnetothermal instability in a collisionless plasma; (2) the regulation of viscous transport by ion-Larmor-scale kinetic instabilities; (3) the efficacy of heat conduction in the presence of ion-Larmor-scale magnetic mirrors; and (4) turbulent dynamo in a collisionless plasma. All of these subjects are connected by a deceivingly simple question: what is the evolution of a plasma in which the long-wavelength (“fluid”) and small-wavelength (“kinetic”) scales are simultaneously driven unstable by the same free-energy source?
Viscosity, Conduction, Dynamo, and Convection in a Weakly Collisional Magnetized Plasma.
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