Temporal and spatial power spectrum studies of numerical simulations of Type II gradient drift irregularities in the equatorial electrojet
Temporal and spatial power spectrum studies of numerical simulations of Type II gradient drift irregularities in the equatorial electrojet
复制标题
赤道电喷射II型梯度漂移不规则数值模拟的时空功率谱研究
DOI：
10.1029/ja084ia04p01419
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
R. Ferch
中科院分区：
文献类型：
--
作者：
M. Keskinen;R. Sudan;R. Ferch
时间和空间的功率谱从计算机模拟的方程模型II型不规则性赤道电射流。使用Ferch和Sudan（1977）的代码计算功率谱，平均时间长达20 s。研究了平均频率和线宽随波长和角度的变化关系。得到的平均频率符合线性理论，除了在短波长，而线宽大于预测的线性阻尼率。还计算了空间功率谱，发现近似各向同性。与雷达观测和Sudan和Keskinen（1977）的理论进行了有利的比较。
Temporal and spatial power spectra from computer simulations of the equations modeling type II irregularities in the equatorial electrojet are presented. The power spectra are computed using the code of Ferch and Sudan (1977), averaging over times as long as 20 s. The dependence of the average frequencies and line widths on wavelength and angle from the electrojet drift is studied. The mean frequencies obtained agree well with linear theory except at short wavelengths, while the line widths are greater than those predicted by the linear damping rates. The spatial power spectra were also computed and found to be approximately isotropic. Favorable comparisons are made with radar observations and the theory of Sudan and Keskinen (1977).