LATITUDINAL EFFECT OF MAGNETIC STORM ON APRIL 6,2000 AT LOW-LATITUDE MERIDIAN CHAIN

In this paper the latitudinal effect of geomagnetic disturbances during the geomagnetic storm on April 6,2000 is analyzed by using minutely averages of H and D components at low latitude geomagnetic meridian chain. The main characteristics are as follows. (1) SC range of H component decreases and the decrease rate increases with decreasing latitude. (2) The range of the second peak of H component and the duration of the initial phase decrease with decreasing latitude during the initial phase. (3) H component decreases speedily and the change range increases with during decreasing in the main phase. (4) The increase of H component is divided to two steps in the recovery phase. H component increases quickly and the change range decreases with decreasing latitude in the former step. The increase rate of H component decreases in the later step. Finally, the intimate relationship between the latitudinal effect of the geomagnetic disturbances and the space current system is discussed.