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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Relativistic electron precipitation as seen by NOAA POES
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Relativistic electron precipitation as seen by NOAA POES

机译：相对论性电子降水所看到的

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摘要

We performed a survey of relativistic electron precipitation (REP) events revealed by the Medium Energy Proton and Electron Detector instrument on board NOAA Polar-orbiting Operational Environmental Satellites during a 38 day interval. We have divided the observed REP events into three groups with respect to the simultaneous observations of energetic (>30 keV) electron and proton precipitation. The first group consists of REP enhancements forming the isotropy zone at the poleward edge of trapped relativistic electron fluxes. These REP events are observed on the nightside, and they are, apparently, produced by isotropization process related to nonadiabatic motion of particles in the stretched magnetic field. The second group are the REP events related to simultaneous enhancements of energetic >30–300 keV electrons. These events have a wider magnetic local time range of occurrence with a maximum in the premidnight sector. They can be related to the interaction of electrons with waves whose possible nature is briefly discussed on the basis of comparison with the cold plasma density in the conjugated region of the equatorial plane. The third group consists of the REP events correlated with the burst-like precipitation of >30–keV protons within an anisotropy zone, where the trapped flux dominates. These events are found in the dusk sector in association with enhanced cold plasma density in the conjugate equatorial magnetosphere. As is known, proton bursts within the anisotropy zone indicate the location of the electromagnetic ion cyclotron (EMIC) wave source. Such REP events can be due to scattering of the relativistic electrons by EMIC waves. However, we noted that some of these REP events are associated with precipitation of energetic electrons with low-energy cutoff below 100 keV. We suggest that in such cases the electrons within a wide energy range are precipitated by other waves (probably, by plasmaspheric hiss).
机译：我们进行了一项调查的相对论性电子降水(代表)事件揭示了媒介能量质子和电子检测器仪器董事会NOAA极轨操作环境卫星在38天时间间隔。分成三组对同时观察精力充沛(> 30 keV)电子和质子降水。集团由代表增强形成各向同性区域向极困的边缘相对论性电子通量。观察到在阴面,,显然,由isotropization过程与非绝热的粒子的运动有关拉伸的磁场。代表事件相关同步吗增强的能量> 30 - 300 keV电子。这些事件有一个广泛的磁性当地时间发生的最大范围premidnight部门。交互的电子与波可能的自然是简要地讨论了在此基础上冷等离子体密度的比较共轭赤道平面的区域。第三组包括代表事件相关>的burst-like降水30-keV质子在一个各向异性区域,困通量占主导地位。黄昏部门与增强的冷等离子体密度的共轭赤道磁气圈。各向异性区域指示的位置电磁离子回旋波(位的来源)。这样的代表事件可能是由于散射的位的相对论电子的波。指出其中的一些代表事件与精力充沛的降水有关电子与低能截止低于100 keV。我们建议在这种情况下,电子宽的能量范围内沉淀了由plasmaspheric嘘其他波(可能)。

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