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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Particle precipitation characteristics in the dayside four-sheet field-aligned current structure
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Particle precipitation characteristics in the dayside four-sheet field-aligned current structure

机译：粒子的降水特征当前的光面four-sheet field-aligned结构

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We study the statistical characteristics of four-sheet structures of large scale field-aligned currents (FACs) with an emphasis on particle precipitation collocated with each FAC sheet observed in dayside using magnetic field and particle precipitation data from the Defense Meteorological Satellite Program (DMSP). A total of 3247 four-sheet events were identified by applying an automatic procedure to the magnetic field data. The occurrence frequency of the events was less than 10% in each magnetic local time (MLT) sector for both hemispheres. The selected events were classified into two groups (type W and type M) with respect to the polarity of FACs. The polarity of the most equatorward type W (type M) FAC sheet is upward (downward). Type W (type M) events are observed predominantly in the morning (evening) sector and display a clear interplanetary magnetic field (IMF) B Y dependence. Type W (type M) events appear for negative (positive) IMF B Y in the Northern Hemisphere with the opposite dependence in the Southern Hemisphere. For each FAC sheet for type W events, we examined the occurrence of different precipitation regions identified with another automatic procedure. The most equatorward FAC sheet is collocated predominantly with central plasma sheet precipitation except for the prenoon sector, where boundary plasma sheet (BPS) precipitation has the highest occurrence. For the second and the third equatorward sheets, boundary layer-like precipitation, BPS near dawn and low-latitude boundary layer near noon, is dominant. In the most poleward sheet, mantle precipitation was observed frequently near noon, while BPS precipitation was dominant at earlier MLTs. These results, especially precipitation characteristics near noon, are consistent with our interpretation of the four-sheet structures, which is based on IMF B Y dependence of convection patterns consisting of lobe, merging, and viscous cells.
机译：我们研究的统计特征four-sheet大规模的结构强调field-aligned电流(流式细胞仪)粒子与每个FAC降水集中的表中观察到的光面使用磁场从国防和粒子沉降数据气象卫星计划(DMSP)。3247 four-sheet事件被确定应用磁自动程序字段数据。在每个磁当地事件还不到10%两个半球的时间(MLT)部门。选择事件被分为两组(W型和M型)的极性流式细胞仪。W型(M)型FAC表向上(向下)。W型(M)型事件观察为主早上(晚上)部门和显示清晰的行星际磁场(IMF) B Y依赖。负(正)国际货币基金组织(IMF) B Y在北方半球的依赖南半球。W事件,我们检查不同的发生降水区域识别与另一个自动程序。表主要集中的中央等离子体片降水除了prenoon部门,边界等离子体片(BPS)降水发生最高。第二、第三个阻碍床单,边界层沉淀,黎明和附近的基点低纬度中午附近的边界层占主导地位。降水量观测经常接近中午,尽管在早些时候BPS降水量占主导地位mlt。接近中午,特点是一致的我们的解释four-sheet结构,基于国际货币基金组织(IMF) Y依赖对流模式组成的叶,合并,和粘性细胞。

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