摘要
Based on the auroral electron/ion precipitation boundary database observed by the DMSP satellites during 1984–2009, the characteristics of the nightside equatorial boundaries of the electron precipitation（B1E） and the ion precipitation（B1I） in the Northern/Southern Hemispheres（NH/SH） are statistically investigated. The results show： That most of the boundaries are located between magnetic latitude（MLAT） of 60°–70° with the mean MLAT for B1E/B1 I to be 64.30°N/63.22°N and 64.48°S/63.26°S in the NH and SH, respectively, indicating that B1 E and B1 I in both hemispheres are located in conjugated magnetic field lines with B1 E ~1.2° poleward of B1I; that the MLAT of B1 E and B1 I in both hemispheres shift to lower MLAT（from ~70° to ~55°） as geomagnetic activity increases; that MLAT of both B1 E and B1 I and their differences slowly decrease from dusk to midnight with some difference in both hemispheres during different levels of geomagnetic activities; that B1 E and B1 I in both hemisphere decrease linearly with Kp and exponentially with Dst, AE, and SYM-H, respectively, demonstrating that auroral particle precipitation is closely related with geomagnetic activity; that in different magnetic local time（MLT） sectors, the changing rates of the boundaries with Kp are different, and the rates of B1 E are generally larger than that of B1 I, implying that the difference between B1 E and B1 I reduce with increasing geomagnetic activity. Compared with previous studies, the statistical results based on the long-term large database in this paper can well reflect the properties of the equatorial boundaries of auroral precipitation and may be used for physical modeling or space weather forecasting in future.
基于 DMSP 卫星在 19842009 期间观察的黎明的电子 / 离子降水边界数据库，夜面的特征电子降水(B1E ) 的赤道的边界和在北 / 南部的半球(NH/SH ) 的离子降水(B1I ) 统计上被调查。结果出现：边界的那个大多数在 60 浳杯湥捩稠湯 ? 敲敶污摥琠慨 ? 桴 ? 牰湩楣慰 ? 潣灭敲獳潩 ? 瑳慲湩爠瑡獥搠 ' 糖锚摀充?敷瑳琠? 慥瑳椠 ? 桴 ? 楤敲瑣潩 ? 的磁性的纬度(MLAT ) 之间被定位景丠? ? 袕 ? 岑亘 ?? ?? 鮪??? 铽 ???? 韧鱌?? 鐿??? 骑 ??? 趬 ? ????
基金
supported by the National Basic Research Program of China(Grant Nos.2012CB957800,2011CB811400)
the National Hi-Tech Research and Development Program of China(Grant No.2010AA121000)
the National Natural Science Foundation of China(Grant Nos.41274147,41204102)
