中文摘要：

对NOAA的POES系列极轨卫星观测得到的1978年以来近30年的极光沉降粒子半球能量的估算值EPI（Estimated Power Input）数据进行了分析，结果表明，极光沉降粒子有显著的春秋分峰值的年变化特征，并且有冬季半球沉降能量较大的南北半球不对称性．对EPI的时均值Pn与地磁指数AE、Dst的相关分析得到，Pn与AE的相关系数为0．76，Pa与Dst的相关系数为-0．55．把南北半球的时均值SPa，NPa数据分别与AE，Dst指数做相关，发现SPa与AE的相关性稍高于NPa的，SPa和NPa与Dst的相关性近似,当时延r=0时，AE与Pa的相关最好，表明全球极光沉降粒子和极光电集流的变化同步；当Dst滞后于Pa，时延r=1～2h，Pa与Dst的相关最好，并且时延r为6～8h，Pa与Dst的相关都好于无时延的水平．

英文摘要：

The data of the estimated power input （EPI） of auroral particles from NOAA/POES （Polar orbiting environmental satellite） for some 30 years have been analyzed. The annual variation of EPI shows equinox peaks, and an asymmetric activity with a higher peak in the winter-hemisphere than in the summer-hemisphere. The variation tendencies of the EPI generally coincide with aa, AE and Dst indices. Studies on the correlations of the hourly average of EPI, Pa, with AE and Dst indices show a correlation coefficient r=0.76 of Pa and AE and r=-0.55 of Pa and Dst. The EPIs for north and south polar regions, NPa and SPa, show a north-south asymmetry with a higher correlation of SPa and AE （or Dst）. Time delays of EPI with respect to magnetic indices are examined, the maximum correlation coefficient of Pa with AE （r=0.78） occurs when the time delay r=0, suggesting a synchronism of auroral electrojet and auroral precipitating particles, while r=1-2 hours, the correlation coefficient of Pa with Dst is maximum （r=0.57）, suggesting that the activity of auroral particle precipitation may influence the ring current to some extent.