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风云1号(FY-1)卫星运行在约870km的近地轨道上,安装于该星上的“空间粒子成分监测器”对相对论电子(>1.6MeV)进行了长期的观测.参考同期的“SAMPEX”卫星同类探测结果,对1999年6月至2005年的风云1号卫星相对论电子观测数据进行了统计分析.并结合ACE卫星太阳风速度数据及地磁活动指数(Dst指数),对近地轨道相对论电子增强事件与高速太阳风和地磁暴的相关关系进行了讨论.分析结果表明日平均通量峰值大于400cm?2·sr?1·s?1的强相对论电子增强事件频发于太阳活动峰年向谷年转变的过渡时期;风云1号卫星在2003～2005年期间观测到4次持续时间长达26～51d不等的相对论电子增强事件,分析表明这4次持续长时间的事件与高速太阳风和强地磁暴密切相关,而且在增强事件爆发前连续发生2～3次强地磁扰动的空间环境扰动特点是这4次事件的一个共同特征;相关系数的计算结果表明,相对论电子增强事件的通量峰值与太阳风速度和Dst指数均具有较好的相关性,强度大的增强事件与太阳风速度和Dst指数的相关性明显优于强度低的事件.
The FY-1 satellite, operating in near-Earth orbit of about 870 km, has long-term observations of relativistic electrons (> 1.6 MeV) on a “space particle component monitor” mounted on the satellite. SAMPEX satellite, the statistical data of relativistic electron observations of the Fengyun-1 satellite from June 1999 to 2005 were statistically analyzed.According to the ACE satellite solar wind velocity data and geomagnetic activity index (Dst index) The relativity between relativistic electron enhancement events of near-Earth orbit and high-speed solar winds and geomagnetic storms are discussed.The results show that strong relativistic electron enhancement events with daily mean fluxes larger than 400cm? 2sr? 1s? 1 occur frequently in the sun During the transitional period from peak year to valley year in Fengyun-1 satellite, four relativistic electron enhancement events ranging from 26 days to 51 days were observed in 2003-2005. The analysis shows that the four events lasting for a long time High-speed solar wind and strong magnetic storms are closely related to each other, and two or three consecutive strong perturbations of geomagnetic disturbances before the outburst of the enhanced event are the common characteristics of these four events. The calculation of the correlation coefficient shows that The peak flux of relativistic electron enhancement event has a good correlation with the solar wind velocity and Dst index. The correlation between the intensity enhancement event and the solar wind velocity and Dst index is obviously better than the low intensity event.