Density and electric field fluctuations associated with the gradient drift instability in the high‐latitude ionosphere
Density and electric field fluctuations associated with the gradient drift instability in the high‐latitude ionosphere
复制标题
与高纬度电离层梯度漂移不稳定性相关的密度和电场波动
DOI：
10.1029/2004gl019703
复制
发表时间：
2004
影响因子：
5.2
通讯作者：
P. Guzdar
中科院分区：
文献类型：
--
作者：
N. Gondarenko;P. Guzdar
利用由主梯度漂移不稳定性引起的高纬斑块结构化的三维非线性模型研究了密度和电场起伏的大小及其谱特征。将模拟结果与从动态探索者2号（DE 2）卫星的正午-午夜和黎明-黄昏轨道获得的同时密度和电场谱进行比较[ Basu等人，1990年]。模拟的密度和电场波动的幅度被发现是在非常好的协议与测量数据。在平行和垂直于对流的方向上，模拟和观测到的密度和电场起伏的光谱斜率分布的相似性被证明。这些发现与我们早期的结果一起[ Gondarenko和Guzdar，1999，2001，2003 ; Gondarenko等人，2003年]提供了一个重要的证据，共存的主要梯度漂移不稳定性和随后的二级Kelvin-Helmholtz和三级剪切流不稳定性。
The magnitudes of the density and electric field fluctuations and their spectral characteristics were studied with a three‐dimensional nonlinear model of the structuring in high‐latitude patches caused by the primary gradient drift instability. The simulations were compared with the simultaneous density and electric field spectra obtained from noon‐midnight and dawn‐dusk orbits of the Dynamic Explorer 2 (DE 2) satellite [ Basu et al., 1990 ]. The magnitudes of the simulated density and electric field fluctuations were found to be in very good agreement with the measured data. In the directions parallel and perpendicular to convection, the similarities in the spectral slope distributions of both simulated and observed density and electric field fluctuations were demonstrated. These findings together with our earlier results [ Gondarenko and Guzdar, 1999 , 2001 , 2003 ; Gondarenko et al., 2003 ] provide a significant evidence for coexistence of the primary gradient drift instability and subsequent secondary Kelvin‐Helmholtz and tertiary shear‐flow instabilities.