Characterizing the Alfvénic slow wind: A case study
Characterizing the Alfvénic slow wind: A case study
复制标题
阿尔夫韦尼克慢风的特征：案例研究
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
L. Matteini
中科院分区：
文献类型：
--
作者：
R. D’Amicis;R. Bruno;L. Matteini
Alfvenity是描述太阳风波动的一个特征，它由速度和磁场分量之间的高度相关性来定义，在理想情况下由动能和磁能的均分来定义。这是一个特征，特别是在大风时，而慢风通常表现出较低的速度和磁场分量的相关性。然而，情况并不总是如此。在某些条件下，在慢风中也可以发现高度的阿尔文现象。在本文中，我们证明了两种速度相似但表现出不同特征的慢太阳风的存在。阿尔文性的不同程度是描述这两种慢风的一个特征。这一特征总是与低磁场可压缩性联系在一起，如本文使用案例研究所示。结果表明，除风速外，阿尔文慢风更接近于快风，而不是标准慢风。这一事实可以归因于……
Alfvenicity is a feature characterizing solar wind fluctuations and is defined by a high correlation between velocity and magnetic field components and in ideal conditions by equipartition between kinetic and magnetic energies. It is a feature characterizing especially the fast wind while slow wind shows usually lower correlation between velocity and magnetic field components. However this is not always the case. Under certain conditions a high degree of Alfvenicity can be found also within slow wind. In the present paper, we show the existence of two kinds of slow solar wind with similar velocities but which display different characteristics. The different degree of Alfvenicity is a feature discrimanating the two types of slow wind. This feature is always linked to a low magnetic field compressibility as shown in the present paper using a case study. It is found that the Alfvenic slow wind is more similar to fast wind rather than to the standard slow wind apart from velocity. This fact can be attributed ...