Inner magnetospheric heavy ion composition during high-speed stream-driven storms
Inner magnetospheric heavy ion composition during high-speed stream-driven storms
复制标题
高速流驱动风暴期间内磁层重离子成分
DOI：
10.1002/jgra.50292
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Forster D
中科院分区：
文献类型：
--
作者：
Forster D
1991年期间，利用释放和辐射效应卫星磁层离子成分谱仪仪器采集的离子成分数据，对8个高速太阳风驱动风暴（HSS）进行了研究。使用OMNI的太阳风数据以及地磁指数来识别HSS，并研究了能量范围为31.2-426.0 keV的离子行为。对1991年7月30日发生的单次HSS事件进行了个案研究，并对五次事件进行了叠加历元分析。数据显示的证据的局部最小值（辍学）的离子种类H+，He+，He++，和O+接近磁层对流的发病的通量和偏数密度。通量和数密度迅速下降，然后在数小时内恢复。观察到数密度的初始快速恢复主要由较低能量的离子组成。当数密度达到其最大值时，离子显示出电子态的迹象。在这些HSS事件期间，观察到重离子与质子的比率大幅降低。
Ion composition data, taken by the Combined Release and Radiation Effects Satellite Magnetospheric Ion Composition Spectrometer instrument, are investigated across eight high‐speed solar wind‐stream‐driven storms (HSSs) during 1991. The HSSs are identified using solar wind data from OMNI alongside geomagnetic indices, and the behavior of ions in the energy range 31.2–426.0 keV is investigated. A case study of the single HSS event that occurred on 30 July 1991 is performed, and superposed epoch analyses of five events are conducted. The data show evidence of a local minimum (dropout) in the flux and partial number density of ionic species H+, He+, He++, and O+close to the onset of magnetospheric convection. The flux and number density rapidly fall and then recover over a period of hours. The initial rapid recovery in number density is observed to consist primarily of lower‐energy ions. As the number density reaches its maximum, the ions show evidence of energization. Heavy ion‐to‐proton ratios are observed to decrease substantially during these HSS events.