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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Eigenmode analysis of compressional poloidalmodes in a self-consistent magnetic field
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Eigenmode analysis of compressional poloidalmodes in a self-consistent magnetic field

机译：压缩poloidalmodes的固有模式分析在一个自洽的磁场

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In this study, we simulate a self-consistent magnetic field that satisfies force balance with a model ring current that is radially localized, axisymmetric, and has anisotropic plasma pressure. We find that the magnetic field dip forms near the high plasma pressure region with plasma β >～0.6, and the formed magnetic dip becomes deeper for larger plasma β and also slightly deeper for larger anisotropy. We perform linear analysis on a ppol of self-consistent equilibria for second harmonic compressional poloidal modes of sufficiently high azimuthal wave number. We investigate the effect of anisotropic pressure on the eigenfrequency of the poloidal modes and the characteristics of the compressional magnetic field component. We find that the eigenfrequency is reduced at the outer edge of the thermal pressure peak and increased at the inner edge. The compressional magnetic field component occurs primarily within 10° of the equator on both the inner and outer edges, with stronger compressional magnetic field component on the outer edge. Larger β and smaller anisotropy can increase the change of eigenfrequency and the strength of the compressional magnetic field component. The critical condition on plasma β and pressure anisotropy of an Alfvén ballooning instability is also identified.
机译：在这项研究中,我们模拟一个自洽满足力平衡的磁场一个模型径向定位环电流,轴对称,各向异性等离子体压力。形成等离子体压力高附近的地区等离子体β> ~ 0.6,形成磁泡对于更大的血浆β也变得更深略大的各向异性。线性分析ppol自洽对二次谐波平衡压缩极向模式足够高的方位波数。各向异性压力的本征频率极向模式的特点压缩磁场分量。外的本征频率降低热压力峰值和增加的边缘在内部边缘。字段组件主要发生在10°赤道的内外边缘,压缩较强磁场组件在外缘。各向异性可以增加的变化本征频率和强度的压缩磁场分量。在等离子体β和压力临界条件各向异性的阿尔芬不断膨胀的不稳定还发现了。

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