用PAMELA实验测量再入反照率质子通量
Re-Entrant Albedo Proton Fluxes Measured by the PAMELA Experiment
摘要：
我们提出了一个精确的测量向下去质子通量的动能以上$\sim$ 70兆电子伏的PAMELA实验在350和610公里之间的高度。在轨迹跟踪模拟的基础上，分析的质子被分为准捕获的，集中在磁赤道区，和非捕获的传播在所有纬度，包括短寿命（沉淀）和长寿命（伪捕获）的组件。此外，还详细研究了地磁截止点附近的半影区特征。PAMELA的结果大大改善了低地球轨道高能质子群的特性。
英文摘要：
We present a precise measurement of downward-going albedo proton fluxes for kinetic energy above $\sim$ 70 MeV performed by the PAMELA experiment at an altitude between 350 and 610 km. On the basis of a trajectory tracing simulation, the analyzed protons were classified into quasi-trapped, concentrating in the magnetic equatorial region, and un-trapped spreading over all latitudes, including both short-lived (precipitating) and long-lived (pseudo-trapped) components. In addition, features of the penumbra region around the geomagnetic cutoff were investigated in detail. PAMELA results significantly improve the characterization of the high energy albedo proton populations at low Earth orbits.
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