The role of higher-order modes on the electromagnetic whistler-cyclotron wave fluctuations of thermal and non-thermal plasmas
The role of higher-order modes on the electromagnetic whistler-cyclotron wave fluctuations of thermal and non-thermal plasmas
复制标题
高阶模对热等离子体和非热等离子体的电磁哨声回旋波涨落的作用
DOI：
10.1063/1.4861865
复制
发表时间：
2014
影响因子：
2.2
通讯作者：
J. Araneda
中科院分区：
文献类型：
--
作者：
A. Viñas;P. Moya;R. Navarro;J. Araneda
实验室和天体物理等离子体的两个基本挑战问题是对具有接近各向同性速度分布函数的无碰撞等离子体的弛豫的理解和电磁等离子体湍流几乎均分能量密度的结果状态。在这里，我们提出了一项研究结果，该研究表明高阶模式在限制热等离子体和非热等离子体中的电磁哨声波动方面发挥了作用。我们的主要结果表明，对于热等离子体，磁波动受限于以最小阻尼高阶模为界的区域。我们进一步表明，随着βe的增加，哨子-回旋加速器正常模式合并电磁波动的区域向更长的波长移动。这个合并区被解释为一个区域的开始，在这里哨子回旋波失去了它们的特性，在与波动合并时变得严重阻尼。我们的结果进一步表明……
Two fundamental challenging problems of laboratory and astrophysical plasmas are the understanding of the relaxation of a collisionless plasmas with nearly isotropic velocity distribution functions and the resultant state of nearly equipartition energy density with electromagnetic plasma turbulence. Here, we present the results of a study which shows the role that higher-order-modes play in limiting the electromagnetic whistler-like fluctuations in a thermal and non-thermal plasma. Our main results show that for a thermal plasma the magnetic fluctuations are confined by regions that are bounded by the least-damped higher order modes. We further show that the zone where the whistler-cyclotron normal modes merges the electromagnetic fluctuations shifts to longer wavelengths as the βe increases. This merging zone has been interpreted as the beginning of the region where the whistler-cyclotron waves losses their identity and become heavily damped while merging with the fluctuations. Our results further indica...