Abstract:

Using data of EISCAT,f 0F2 from ionosondes of Zhongshan Station in Antarctica and station chain in China,the ionospheric disturbance on May 2-3,1991 is analyzed.The features representing processes of electrodynamic and dynamic couplings during a magnetic storm are compared carefully.It shows that in this sample the disturbance is mainly caused by magnetospheric convection.Analysis of geomagnetic data from stations around the world indicates,viewing from another angle,that the coupling mechanism discussed here is reasonable.