太阳粒子事件爆发期间近相对论电子的双峰电子通量：1。意见
Bimodal Electron Fluxes of Nearly Relativistic Electrons during the Onset of Solar Particle Events: 1. Observations
摘要：
我们报告的几个太阳高能粒子事件的强度和各向异性测量的能量范围~ 27 ~~ 500 keV的高能电子观测与风和ACE航天器在2000年6月。Wind上的观测显示了双峰俯仰角分布（PAD），而ACE显示了一个峰值的PAD，就像通常在太阳上观察到的电子脉冲注入一样。在观测期间，风位于地球弓形激波的上游，在黎明-中午扇区，距离地球约40至70地球半径，并且与准平行弓形激波有很好的磁性连接，而ACE位于天平动点L1，与弓形激波没有连接。电子强度-时间剖面和能谱表明，在Wind观测到的回流电子不是磁层起源的。观测结果表明，双模电子PAD是由于在反向阳方向距离小于150地球半径的障碍物处的反射或散射，与地球磁层的弓形激波或磁鞘相一致。
英文摘要：
We report for several solar energetic particle events intensity and anisotropy measurements of energetic electrons in the energy range ~ 27 to ~ 500 keV as observed with the Wind and ACE spacecraft in June 2000. The observations onboard Wind show bimodal pitch angle distributions (PAD), whereas ACE shows PADs with one peak, as usually observed for impulsive injection of electrons at the Sun. During the time of observation Wind was located upstream of the Earth's bow shock, in the dawn - noon sector, at distances of ~ 40 to ~ 70 Earth radii away from the Earth, and magnetically well connected to the quasi-parallel bow shock, whereas ACE, located at the libration point L1, was not connected to the bow shock. The electron intensity-time profiles and energy spectra show that the backstreaming electrons observed at Wind are not of magnetospheric origin. The observations rather suggest that the bi-modal electron PADs are due to reflection or scattering at an obstacle located at a distance of less than ~ 150 Earth radii in the anti-sunward direction, compatible with the bow shock or magnetosheath of the magnetosphere of the Earth.
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