Influence of finite ion Larmor radius on the dynamics of weakly-collisional plasma jets colliding in magnetic arch

Abstract

The effect of the finite ion Larmor radius on the dynamics of two counterstreaming weakly collisional plasma flows in a magnetic field of an arch configuration is considered. Hybrid numerical simulations show that in a system whose dimensions are close to the ion Larmor radius, more intense interaction dynamics are observed, the magnetic arch experiences a significant expansion with the formation of a region with an irregular character of magnetic lines, in which magnetic reconnection processes occur. In this case, the generation of a surface wave of the ion-cyclotron range is observed at the boundaries of the arch. An increase in the scale of the system compared to the ion Larmor radius leads to a transition to the ideal MHD regime, in which the evolution of the arch occurs much more slowly, and the development of instabilities is not observed.

12 pages, 4 figures, submitted to J. Plasma Phys

References in corpus (5)

• Universal instability for wavelengths below the ion Larmor scale
• Effect of Finite Larmor Radius on the Cosmic Ray Penetration into an Interplanetary Magnetic Flux Rope
• The non-ideal finite Larmor radius effect in the solar atmosphere
• Saturation of the compression of two interacting magnetic flux tubes evidenced in the laboratory
• Numerical modeling of two magnetized counter-propagating weakly collisional plasma flows in arch configuration