磁动力消散:空间与时间结构
天体物理学
2009-11-07 v1
摘要
由边界上磁场线锚定运动驱动的磁主导等离子体必须消散对其所做功的能量,无论电阻多小。数值实验阐明了消散通过形成电流层级实现。磁场线局部缠绕的概率分布函数近似为高斯,宽度约为一。消散在空间和时间上高度不规则,但平均消散水平由独立于电阻的尺度律描述。如果在一段时间内暂停边界驱动,磁动力消散迅速降至可忽略水平,磁场进入近似无力状态。 renewed boundary driving leads to a quick return to dissipation levels compatible with the rate of boundary work, with dissipation starting much more rapidly than when starting from idealized initial conditions with a uniform magnetic field. 将这些概念应用于日冕可为真实的三维数值模型提供了可信度,这些模型预测的辐射量、日冕结构和加热率均与观测一致。
引用
@article{arxiv.astro-ph/0207204,
title = {Rayleigh Laser Guide Star Systems: UnISIS Bow Tie Shutter and CCD39 Wavefront Camera},
author = {Laird A. Thompson and Scott W. Teare and Samuel L. Crawford and Robert W. Leach},
journal= {arXiv preprint arXiv:astro-ph/0207204},
year = {2009}
}
备注
19 pages, 5 figures, accepted for publication in October 2002 issue of PASP