THE TRANSITIONAL CHARACTERISTICS OF MAGNETOHY-DRODYNAMIC ACCELERATION IN SOLAR WIND FLOW
-
摘要: 本文讨论了轴对称磁力线管中太阳风从亚声速和亚阿尔文速度加速到超声速和超阿尔文速度的过程。考虑到流动和场的二维效应以后,除去临界声速线M2=1以外,还有临界阿尔文速线MA2=1和M2+MA2=1。这时,磁力线管中存在三次过渡,使磁流体力学方程组的类型从椭圆型变为双曲型,再变为椭圆型,最后变为双曲型。由于日冕中的典型声速和阿尔文速度具有相同的量级,而且人们对磁力线管的急剧膨胀很有兴趣,这就需要讨论二维磁流体力学方程组的自(冫合)解。太阳风的局部流管中有可能出现多次过渡的流动特征。Abstract: In this paper, the accelerating feature of solar wind flow from subsonic and sub-Alfven velocity into supersonic and super-Alfven velocity is discussed in the axis-symmetric magnetic flux tube. In addition to the critical sonic line M2=1, there are critical Alfven line MA2=1 and line M2+MA2=1 if the two-dimensional effects of the flow and magnetic field are included. In this case, there is thrice transitions for the solar wind flow in the magnetic flux tube, and the type of the magnetohydrodynamic equations will change from elliptic ones into hyperbolic ones, then the elliptic, and at last, into the hyperbolic ones. The consistent solutions of the magnetohydrodynamic equations for the solar wind flow need to study, because the typical sonic velocity has the magnitude of order just the same as the typical Alfven velocity and the rapid expansion of the magnetic flux tube is interested. There may exist several transitions for solar wind flow in the local flow tube.
-
-
计量
- 文章访问数: 1833
- HTML全文浏览量: 66
- PDF下载量: 944
-
被引次数:
0(来源:Crossref)
0(来源:其他)