Disturbance propagation characteristics of ionosphere F layer 120° meridian chain during one magnetic storm

We investigated disturbance propagation characteristics of ionosphere at three stations near 120° meridian chain using data by Vertical sounder during geomagnetic storms form April 12, 1981 to April 16, 1981. The result showed that there have significant perturbation of foF2 and h´F in the ionosphere at three stations during Magnetic storm, at the same time seven traveling ionospheric disturbance (TID) events occurred from higher latitude to lower latitude. Most events of TID happened at night, and the phase velocity increase gradually directing to low latitude.