不同类型扇形边界对地磁活动的影响

本文对四种不同类型的行星际磁场的扇形边界对地磁活动的影响作了统计研究,发现当扇形边界内磁场强度增加并且取南向的这种扇形边界扫过地球时,地磁活动指数D_st增加最快,大约在11小时地磁活动指数D_st达到最大值。 

THE INFLUENCES OF THE IMF SECTOR BOUNDARIES OF FOUR DIFFERENT TYPES ON THE GEOMAGNETIC FIELD ACTIVITY

The influences of the IMF sector boundaries of four types on the geomagnetic field activity have been studied statistically.It is found that when a sector boundary with magnetic field intensity increasing and magnetic field direction orienting southward sweeps the earth,the value of the D_st index begins to increase and achieve its maximum value in about 11 hours,which is the shortest time for the D_st to achieve its maximum in the four types of the sector boundaries which have been studied in this work.