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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Dependence of Relativistic Electron Precipitation in the Ionosphere on EMIC Wave Minimum Resonant Energy at the Conjugate Equator
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Dependence of Relativistic Electron Precipitation in the Ionosphere on EMIC Wave Minimum Resonant Energy at the Conjugate Equator

机译：相对论电子降水的依赖在电离层波位的最低共振能源在共轭赤道

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摘要

We investigate relativistic electron precipitation events detected by Polar Environmental Satellites (POES) in low-Earth orbit in close conjunction with Van Allen Probe A observations of electromagnetic ion cyclotron (EMIC) waves near the geomagnetic equator. We show that the occurrence rate of >0.7 MeV electron precipitation recorded by POES during those times strongly increases, reaching statistically significant levels when the minimum electron energy for cyclotron resonance with hydrogen or helium band EMIC waves at the equator decreases below ?1.0–2.5 MeV, as expected from the quasilinear theory. Both hydrogen and helium band EMIC waves can be effective in precipitating MeV electrons. However, >0.7 MeV electron precipitation is more often observed (at statistically significant levels) when the minimum electron energy for cyclotron resonance with hydrogen band waves is low (E_(min) = 0.6–1.0 MeV), whereas it is more often observed when the minimum electron energy for cyclotron resonance with helium band waves is slightly larger (E_(min) = 1.0–2.5 MeV). This is indicative of the warm plasma effects for waves approaching the He~+ gyrofrequency. We further show that most precipitation events had energies > 0.7–1.0 MeV, consistent with the estimated minimum energy (E_(min) ～ 0.6 ? 2.5 MeV) of cyclotron resonance with the observed EMIC waves during the majority of these events. However, 4 out of the 12 detected precipitation events cannot be explained by electron quasi-linear scattering by the observed EMIC waves, and 12 out of 20 theoretically expected precipitation events were not detected by POES, suggesting the possibility of nonlinear effects likely present near the magnetic equator, or warm plasma effects, and/or narrowly localized bursts of EMIC waves.
机译：我们研究相对论性电子降水事件检测到极地环境卫星近地轨道(po)密切结合范艾伦辐射探测器的观测电磁离子回旋波附近(位的)地磁赤道。出现率> 0.7兆电子伏电子由坡降水记录在这些时候强烈的增加,达到统计上当最低电子显著水平能源与氢或回旋共振氦在赤道带位的波减少下面? 1.0 - -2.5兆电子伏,如预期拟线性理论。位的波可以有效地诱发兆电子伏电子。降水是经常观察(统计上的显著水平)时最低电子回旋共振的能量与氢带波很低(E_ (min) =0.6 - -1.0兆电子伏),而更多的是观察当最低电子回旋加速器的能量共振与氦乐队略大(E_ (min) = 1.0 - -2.5兆电子伏)。象征着温暖的等离子体效应的波浪接近他~ +旋转频率。表明大多数降水事件的能量> 0.7 - -1.0兆电子伏,与估计一致最低能源(E_(分钟)~ 0.6 ?回旋共振与观察到的位的波在大多数的这些事件。12个检测降水事件不能被解释为电子准线性观察到的位的波散射,1220理论上预期的降水事件没有检测到坡,暗示非线性效应可能存在的可能性在磁赤道附近,或温暖的等离子体效果,和/或狭隘的本地化的位的爆发波。

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