积分电导率对广义R-T不稳定性的影响

Effects of flux tube integrated conductivity and its zonal gradient on the generalized R-T instability

从质量和电荷守恒方程出发,利用通量管积分方法,导出了背景电导率存在空间梯度时R-T不稳定性线性增长率的表达式,分析和估计了E区Pedersen电导率和电导率的空间梯度对线性增长率的影响。结果表明:F区积分Pedersen电导率与E区和F区积分Pedersen电导率之和的比值与线性增长率呈显著的正相关,有限的E区Pedersen电导率可显著抑制F区不规则结构的生成和发展。通量管积分Pedersen电导率的纬圈梯度对线性增长率的影响可达约35%以上,是控制夜间电离层不规则结构生成和发展的一种重要因素。

With the technology of integrating along flux tube, the description of linear growth rate of R-T instability are presented considering the background conductivities and their spatial gradients based on the quality and the charge conservation equations. Effects of the E-region Pedersen conductivity and its spatial gradients on R-T instability linear evolvement are analyzed and estimated. The results show that, the ratio of F-region integrated Pedersen conductivity and the sum of E- and F-region integrated Pedersen conductivity has a significant correlation with the linear growth rate; finite E-region Pedersen conductivity could significantly restrain the generation and development of F-region irregularities. The zonal gradient of flux tube integrated Pedersen conductivity could make the linear growth rate decrease about 35% or more, implying that it is an important factor to control the generation and development of the ionospheric irregularities.