声重波激发的赤道Spread—F的拓扑特性研究  

A STUDY ON TOPOLOGICAL FEATURE OF THE EQUATORIAL SPREAD-F UNDER THE EXISTENCE OF ACOUSTIC-GRAVITY WAVES

作　　者：谢红[1] 萧佐[1] 王宪民[2] 

机构地区：[1]北京大学地球物理系,100871 [2]航天医学工程研究所

出　　处：《空间科学学报》1997年第4期309-316,共8页Chinese Journal of Space Science

基　　金：国家自然科学重大基金!49301400

摘　　要：本文对声重波激发的Spread-F扰动的非线性制约方程的拓扑特性进行了定性讨论和数值计算．研究了Spread-F的混沌特征及参数范围．结果表明声重波在不同条件时对Spread-F的激发作用有本质的不同．In this paper, a qualitative discussion and numerical calculations are made for thetopological characteristics of the nonlinear govehong equations of the excitations ofequatorial Spread-F under existence of acoustic-gravity waves. The results show thatin detendning the pertUrbahon features of Spread-F the amplitudes of asoustic-gravitywaves take an important role. When the amplitude of acoustic-gravity wave is small,features of the equations' singularity are similar tO situations without AGWs, i. e.,nonlinear resoluhons will finally stabilized to two fixed ponts, as the amplitude ofAGWs becomes larger, there will be a crihcal value. Above this value, soluhons showchaotic characterishcs, and Spread-F will have rich spectral components. When theamplitude of AGWs getting even larger than a second crihcal value, the soluhons ofthe system recovers from chaohc to Periodic and the features of solutions are mainlydetermined by AGWs as extemal driving souree.

关 键 词：SPREAD-F 声重波 混沌 拓扑 赤道 电离层 

分 类 号：P421.34[天文地球—大气科学及气象学] P352