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“嫦娥一号”卫星(CE-1)的太阳高能粒子探测器(HPD)是国际上首次在200公里极月轨道观测高能带电粒子的探测仪器.HPD的科学目标是探测月球轨道空间的高能带电粒子(质子、电子和重离子)成分、能谱、通量和随时间的演化特征.通过比较分析HPD的观测结果、ACE卫星的观测结果与CRèME86模型的模拟计算结果,表明在太阳活动低年空间环境相对宁静时期,当月球处于太阳风中时,月球附近具有和行星际空间相近的宇宙线粒子流量背景.卫星在轨运行中发现了多起0.1～2MeV的高能电子流爆发事件.文中总结了2007年11月26日至2008年2月5日HPD观测的41起高能电子流爆发事件,发现此类现象可以发生在从太阳风到磁尾的所有空间区域.在月球经历的不同空间区域中,高能电子流爆发事件可能存在不同的诱发机制.
The solar high-energy particle detector (HPD) of CE-1 is the first detection instrument for observing high-energy charged particles in the polar orbit of 200 km in the world for the first time.The scientific goal of HPD is to probe the lunar orbit space The composition, energy spectrum, flux and evolution characteristics of high-energy charged particles (protons, electrons and heavy ions) over time are analyzed.A comparative analysis of the observed results of HPD, the observed results of ACE satellite and the CRèME86 model shows that in the solar activity When the moon is in the solar wind, the background of the cosmic ray particle flux near the moon has a similar background with that of the interplanetary space. In the orbital operation of the satellite, more high-energy electron current outbreaks of 0.1 ~ 2 MeV were found. Summarized 41 HPD observations from November 26, 2007 to February 5, 2008, and found that such phenomena can occur in all spatial regions from the solar wind to the magnetotail. In different spatial regions of the lunar experience Medium and high energy electron current may have different triggering mechanism.