【摘要】 利用1991年南极中山站的地磁资料，分析研究了极夜（5，6，7月）及极昼（11，12月）期间地磁场的变化规律及特征．结果表明，极昼期间的S出现的双峰现象要比极夜期间的明显的多，S是叠加在S之上的极盖区地磁场静日变化；极夜期间的Sq,Sq和SD的变化幅度小于极昼期间的变化幅度，大约是极昼期的1／3，SD大约是极昼的3／4.这主要是由于极夜期间太阳的直射点在北半球，在南半球太阳的波辐射少；极昼期间太阳直射点在南半球，太阳的波辐射增大，致使空间电离层等效电流强度发生变化产生的．更多还原

【Abstract】 The regularities and characteristics of geomagnetic daily variation (Sq, Sq, SD) in the polar night (May, June, July) and polar days (Nov., Dec.) have been analyzied and studied by using geomagnetic data obtained at Zhongshan station of Antarctica in 1991. The results show that double peak of Sq in the polar day was muh more outstanding than that ones in the polay night. Sq is geomagnetic quite day variation at the polar region superposed on the Sq. The amplitudes of Sq. Sq and SD in the polar night are less than that ones in the polar days. SD is three fourth of amplitudes for polar day they are only one third of amplitudes for polar day. Maybe the wave radiation of sun decreases when sun radiates direct to northern hemisphere in the polar nigh; the wave radiation of sun increase when that to southern hemisphere in the polar dny.So, it causes the change of equlvalent current intensity in ionosphere.更多还原