Abstract

A specificity of the boundary between the photosphere and the chromosphere of the Sun consists in considerable acceleration of plasma spicules above this boundary and appearance of wave motions (predominantly Alfvén waves). Analytical solution to the equations of magnetic hydrodynamics is constructed in the vicinity of this boundary from the chromosphere side. Expressions describing the growth of velocity of plasma spicules and the Alfvén waves in this vicinity are derived. It is demonstrated that the vertical motion of the Alfvén waves and spicules is accompanied by horizontal motion of plasma in the presence of a vertical component of magnetic induction. The obtained expressions characterize the diversity of directions and complexity of motions in the lower chromosphere. They demonstrate that the horizontal component of magnetic induction considerably increases near the lower boundary of the chromosphere. The vertical velocity of spicules among which fast spicules II are dominant and the velocity of the Alfvén waves substantially increase in a very thin layer of the lower chromosphere, by a factor of 1.8 and 1.5, respectively. Estimates of the horizontal motion of spicules and the vertical component of magnetic induction are obtained.

中文翻译：

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太阳下​​层的物理过程

摘要

太阳的光层和色度层之间的边界的特殊性在于，在此边界上方的血浆针状体有相当大的加速度，并且出现了波运动（主要是Alfvén波）。从色球层侧在该边界附近构造了磁流体动力学方程的解析解。得出描述该区域血浆针状体和Alfvén波速度增长的表达式。结果表明，在磁感应的垂直分量存在的情况下，Alfvén波和针状体的垂直运动伴随着等离子体的水平运动。所获得的表达式表征了较低色球层中方向的多样性和运动的复杂性。他们证明磁感应的水平分量在色球层的下边界附近显着增加。针的垂直速度占主导地位，其中快速针II占主导，Alfvén波的速度在较低色球层的非常薄的一层中显着增加，分别增加了1.8和1.5倍。获得了针的水平运动和磁感应的垂直分量的估计。