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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Storm time impulsive enhancements of energetic oxygen due to adiabatic acceleration of preexisting warm oxygen in the inner magnetosphere
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Storm time impulsive enhancements of energetic oxygen due to adiabatic acceleration of preexisting warm oxygen in the inner magnetosphere

机译：风暴时间冲动增强精力充沛由于绝热加速氧气先前存在的温暖内心中的氧气磁气圈

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摘要

We examine enhancements of energetic (>50 keV) oxygen ions observed by the Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE) instrument on board the Van Allen Probes spacecraft in the inner magnetosphere (L~6) at 22–23 h magnetic local time (MLT) during an injection event of the 6 June 2013 storm. Simultaneous observations by two Van Allen Probes spacecraft located close together (~0.5 R_E) indicate that particle injections occurred in the premidnight sector (<~24 h MLT). We also examine the evolution of the proton and oxygen energy spectra at L ~ 6 during the injection event. The spectral slope did not significantly change during the storm. The oxygen phase space density (PSD) was shifted toward higher PSD in a wide range of the first adiabatic invariant. The spectral evolution manifests the characteristics of adiabatic acceleration and density increase of oxygen ions. Warm (0.1–10 keV) oxygen measured by the Helium, Oxygen, Proton, and Electron (HOPE) instrument was enhanced prior to the storm mostly in magnetic field-aligned directions. The most reasonable scenario of this event is that warm oxygen ions that preexisted in the inner magnetosphere were picked up and adiabatically transported and accelerated by spatially localized, temporarily impulsive electric fields.
机译：我们检查增强精力充沛(> 50 keV)氧离子辐射带观察的风暴探针离子成分实验(RBSPICE)仪器范艾伦辐射探测器上飞船内磁气圈(L ~ 6)当地时间22日至23日h磁(MLT)在一次2013年6月6日风暴注入事件。同时观察两个范艾伦辐射探测器航天器位于接近(~ 0.5 R_E)表明粒子注入发生premidnight部门(< ~ 24 h MLT)。质子的进化和氧能量光谱在L ~ 6注入事件。光谱斜率没有显著变化在暴风雨中。(PSD)转向更高的PSD在宽第一个绝热不变量的范围。谱演化表现特征绝热加速和密度增加氧离子。氦、氧、质子和电子(希望)仪器主要增强风暴之前在磁性field-aligned方向。这个事件的合理的场景是温暖氧离子先前存在的内在磁气圈是捡起和绝热地运输和加速了空间本地化,暂时脉冲电场。

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