不同波长初始电子密度扰动对扩展F触发效应对比研究

基于适合描述中低纬电离层扩展F发展的控制方程组, 首次对比分析了不同波长初始电子密度扰动对电离层Spread-F的触发影响, 讨论了电离层泡状结构和块状结构不规则体对不同电子密度扰动波长的响应效果.结果发现:无论是以泡状结构为主体还是以块状结构为主体的不规则体, 短波长扰动相对于长波长扰动更有利于Spread-F的激发; 当初始电子密度减弱扰动存在于一侧, 而增强扰动存在于另一侧时, 与只存在一种情况相比, 泡状结构和块状结构同时出现, 能够增进彼此的扰动幅度, 并且泡状结构不规则体的抬升速度大于块状结构; 相同电离层背景下, 初始扰动所引起的泡状不规则体和块状不规则体不一定都能得到抬升和发展, 两者发展趋势并不一致.

A comparative study on the effects of different wavelengths of initial electron density disturbances on triggering spread-F

Based on a physical model developed to present the development of the lower and mid-lati-tudes spread-F,the effects of different disturbances of electron density on triggering spread-F are compared and the evolution of plasma bubble and blob irregularities under different perturbation wavelengths of elec-tron density are discussed.The results show that no matter electron density is bubble or blob structure, the disturbances with short wavelength are much easier to trigger spread-F than long ones.When the initial disturbance with decreasing electron density exists in one side and increasing electron density disturbance appears in another side at the same time,the perturbation amplitude of each other will be much more en-hanced than that when they appear respectively,and the uplift rate of bubble structure is much faster than blob.Even if at the same level of electron density,the electron density bubble and blob structure do not al-ways be lifted or developed simultaneously and they do not always keep the same tendency.