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本文利用SAMPEX和GOES-10卫星的观测数据研究了2002年9月28日至10月8日强磁暴期间外辐射带高能电子通量的演化.两颗卫星的观测结果均显示,在磁暴恢复相期间,高能电子通量呈现出显著的增强,于10月6日达到最大值.SAMPEX卫星在L=3.5处观测到1.5～14MeV和2.5～14MeV两个能量通道的电子通量的最大值为6×102cm-2s-1sr-1keV-1和5×103cm-2s-1sr-1keV-1,分别比磁暴前上升了约10和8倍.而GOES-10卫星于同步轨道附近观测到的>0.6MeV和>2MeV的电子通量峰值为磁暴前的50倍和30倍.本文进一步利用ClusterC3卫星研究了磁暴期间背景等离子体参数和哨声模合声(chorus)波的活动现象.ClusterC3卫星于10月1日与10月4日两次穿过外辐射带区域,观测到高强度(10-5～10-4nT2Hz-1)的合声波.数值计算表明观测到的合声波能够与外辐射带高能电子产生回旋共振作用.本文多卫星联合观测和数值模拟的结果为合声波驱动的外辐射带高能电子的回旋共振加速机制提供了新的证据.
In this paper, we use the SAMPEX and GOES-10 satellite observations to study the evolution of the high-energy electron flux over the outer radiation band during the strong magnetic storm from September 28 to October 8, 2002. The observations from both satellites show that during the magnetic storm recovery phase During which the high-energy electron flux showed a significant enhancement and reached the maximum on October 6. The maximum of the electron fluxes observed by the SAMPEX satellite at L = 3.5 between 1.5-14 MeV and 2.5-14 MeV was 6 × 102cm-2s-1sr-1keV-1 and 5 × 103cm-2s-1sr-1keV-1, respectively, increased by about 10 and 8 times respectively than before the magnetic storms. However, GOES-10 satellite observed> 0.6MeV And> 2MeV peak were 50 times and 30 times higher than that of pre-storms.This paper further studied the background plasma parameters and the chorus wave activity during the magnetic storm using the ClusterC3 satellite.ClusterC3 satellite in October The coherent sound waves with high intensity (10-5 ~ 10-4nT2Hz-1) were observed through the outer radiation zone twice on October 1 and October 4. The numerical results show that the observed co-wave can interact with the high-energy electrons Resulting in cyclotron resonance.This multi-satellite joint observations and numerical simulation results for the combined sound-driven Radiation with high-energy electron cyclotron resonance acceleration mechanism provides new evidence.