Navarro Alejandro Bañón, Teaca Bogdan, Told Daniel, Groselj Daniel, Crandall Paul, Jenko Frank
Department of Physics and Astronomy, UCLA, 475 Portola Plaza, Los Angeles, California 90095-1547, USA.
Applied Mathematics Research Centre, Coventry University, Coventry CV1 5FB, United Kingdom.
Phys Rev Lett. 2016 Dec 9;117(24):245101. doi: 10.1103/PhysRevLett.117.245101. Epub 2016 Dec 7.
We analyze plasma heating in weakly collisional kinetic Alfvén wave turbulence using high resolution gyrokinetic simulations spanning the range of scales between the ion and the electron gyroradii. Real space structures that have a higher than average heating rate are shown not to be confined to current sheets. This novel result is at odds with previous studies, which use the electromagnetic work in the local electron fluid frame, i.e., J·(E+v_{e}×B), as a proxy for turbulent dissipation to argue that heating follows the intermittent spatial structure of the electric current. Furthermore, we show that electrons are dominated by parallel heating while the ions prefer the perpendicular heating route. We comment on the implications of the results presented here.
我们使用跨越离子和电子回旋半径之间尺度范围的高分辨率陀螺动力学模拟，分析了弱碰撞动力学阿尔文波湍流中的等离子体加热。结果表明，加热速率高于平均水平的实空间结构并不局限于电流片。这一新颖的结果与之前的研究不一致，之前的研究使用局部电子流体框架中的电磁功，即J·(E + ve×B)，作为湍流耗散的代理，认为加热遵循电流的间歇性空间结构。此外，我们表明电子以平行加热为主，而离子则倾向于垂直加热路径。我们对这里给出的结果的含义进行了评论。
