arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.2968physics.plasm-ph
收藏

非平衡双流体等离子体可以同时产生磁场和流动

Non-equilibrium two-fluid plasmas can generate magnetic fields and flows simultaneously

Hamid Saleem

摘要:

通过假设密度n在xy平面内为指数分布,电子(离子)温度在yz平面内为线性分布,提出了一种新的高度非线性双流体方程组的解析解,用以解释“种子”磁场和等离子体流的产生机理. {It证明了斜压矢量- $\nablaΨ\times\nabla T_{j}$(其中$Ψ= ln\bar{n}, \bar{n}$为归一化密度,$T_{j}$为电子和离子的温度,j = e,i)不仅能产生磁场,而且能产生等离子体流。}同时指出,电子磁流体动力学(EMHD)模型在慢时间尺度上产生磁场时,由于没有考虑离子动力学而存在不一致性。利用该模型对经典激光等离子体中磁场的大小进行了估算,与实验观测结果一致。

英文摘要:

A new analytical solution of the set of highly nonlinear two-fluid equations is presented to explain the mechanism for the generation of "seed" magnetic field and plasma flow by assuming the density n to have a profile like an exponential in xy-plane and temperature profiles of electrons (ions) to be linear in yz-plane. {It is shown that the baroclinic vectors - $\nablaΨ\times\nabla T_{j}$ (where $Ψ= ln\bar{n}, \bar{n}$ is normalized density, and $T_{j}$ denote the temperatures of electrons and ions for j = e, i) can generate not only the magnetic field but the plasma flow as well.} It is also pointed out that the electron magnetohydrodynamics (EMHD) model has inconsistencies because it does not take into account the ion dynamics while the magnetic field is produced on slow time scale. The estimate of the magnitude of the magnetic field in a classical laser plasma using this model is in agreement with the experimental observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑