ESF大尺度湍谱分布特性

THE MAIN FEATURES OF THE TURBULENCE SPECTRUM DISTRIBUTION OF THE LARGE SCALE EQUATORIAL SPREAD'F

本文从考虑磁剪切效应的电子连续性方程出发,直接进行两点重正化,建立并解析求解了电子密度涨落关联函数<δn(1)δn(2)>的演化方程.得到的谱<(δn)2>k在谱形,强度变化和最小方差拟合的谱指数等方面均与赤道扩展F大尺度湍谱分布实验结果符合较好.统一解释了通常分为Medium,Intermediate两区的实验结果,同时说明了F峰上、下的谱形相似和垂直与平行于地面的两个方向上的谱形相似问题.

Starting from the electron continuity equation and considering the effect of a weak geomagnetic shear, after a direct two point regularization, a equation for the evolution of the correlation function of the electron density fluctuation <δn(1)δn(2)> was established and analytically resolved. The resulting spectra are in fair agreement with the observational turbulence spectra of the large scale equatorial spread-F (λ≥100m) in spectral shape, intensity and indexes by the method of least variance fitting. Thus, a unified explaination of the experimental results generally for both the medium and intermediate scale are given, and the similarity of the shapes for above and below the F peak, or for parallel and perpendicular to the earth's surface is also explained.