流动对太阳黑子精细结构的影响

考虑磁扩散率为温度的函数以及绝热条件,线性扰动磁流力学方程组的色散方程是频率的三次方程。由于沿磁场流动的速度u₀小于声速u_s,即ε=u₀2/u_s2是一个小量,在零级近似下解色散方程,得到了磁扩散不稳定性。本文进一步讨论在一级近似下小流动对磁扩散不稳定性的影响。结果表明,小流动不破坏磁扩散不稳定性的存在,并且,它对波数空间中的不稳定区也影响不大。 

THE INFLUENCE OF FLOWS ON THE FINE STRUCTUREOF SUNSPOTS

The dispersion equation of linear disturbance magnetohydrodynamics equations is an algebraic equation of third power of frequency when the magnetic diffusivity is considered as a function of temperature. Developing dispersion equation with small parameter ε = u₀2/u_s2, the square of disturbing velocity over sound speed, and taking the zero order approximation of e, the magnetic diffusion instability can be obtained when the dispersion equation is solved.In this paper, the influence of small flows on the magnetic diffusion instability is discussed under the first order approximation of ε. The solution appears that it does not lose the magnetic diffusion instability with the existance of small flows in the dispersion equation and there are a few influence of small flows on the area of the magnetic diffusion instability in the wave number space.