Experimental evidence of a zonal magnetic field in a toroidal plasma
Experimental evidence of a zonal magnetic field in a toroidal plasma
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DOI：
10.1103/physrevlett.98.165001
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发表时间：
2007-04-20
影响因子：
8.6
通讯作者：
Diamond, P. H.
中科院分区：
文献类型：
--
作者：
Fujisawa, A.;Itoh, K.;Diamond, P. H.
在环形等离子体中发现了带状磁场。磁场具有对称带状结构，在环形和极向方向上均匀，并以有限的介尺度波长径向变化，类似于纬向流。与时间相关的双相干分析表明，磁场应该是由背景等离子体湍流产生的。这一发现被归类为一种新型的结构磁场产生现象，使人们能够深入了解旋转行星中偶极子场的产生等现象。
A zonal magnetic field is found in a toroidal plasma. The magnetic field has a symmetric bandlike structure, which is uniform in the toroidal and poloidal directions and varies radially with a finite wavelength of mesoscale, which is analogous to zonal flows. A time-dependent bicoherence analysis reveals that the magnetic field should be generated by the background plasma turbulence. The discovery is classified as a new kind of phenomenon of structured magnetic field generation, giving insight into phenomena such as dipole field generation in rotational planets.