Motions of the Convection Reversal Boundary and Local Plasma in the High‐Latitude Ionosphere
Motions of the Convection Reversal Boundary and Local Plasma in the High‐Latitude Ionosphere
复制标题
高纬度电离层对流反转边界和局域等离子体的运动
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
R. Heelis
中科院分区：
文献类型：
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作者：
Yun‐Ju Chen;R. Heelis
我们提出了来自国防气象卫星计划F13，F15，F16，F17，和F18卫星在2007年至2015年期间描述对流反转边界（CRB）的运动研究了CRB在赤道和极地方向上的连续运动情况，50分钟，45%的时间CRB的运动可能会偏离当地的等离子体运动附近的黎明和黄昏的重联过程是不可能存在的。在推断的CRB运动和局部等离子体运动的差异可能会出现从明显的运动引起的连续样品的本地时间位移的CRB是倾斜的相对于一条线的恒定纬度。CRB上存在的粘性相互作用也可能导致CRB和等离子体运动的差异。考虑到这些过程，CRB运动和CRB处的等离子体运动只有在几分钟的时间尺度上的来回运动叠加在CRB在较长时间段内的单调迁移上时才是一致的。
We present results from a systematic study of multisatellite samplings from the Defense Meteorological Satellite Program F13, F15, F16, F17, and F18 satellites over the period from 2007 to 2015 that describe the motion of the convection reversal boundary (CRB) and the local plasma flow across it. Focusing on the cases with continuous poleward and equatorward CRB motion sampled by three consecutive satellites within 50 min, 45% of the time the CRB motion may deviate from the local plasma motion near dawn and dusk where the reconnection process is unlikely to be present. Differences in the inferred CRB motion and the local plasma motion may arise from apparent motion induced by the local time displacement of consecutive samples across the CRB that is tilted with respect to a line of constant latitude. The presence of a viscous‐like interaction across the CRB can also contribute to the difference in the CRB and plasma motion. Accounting for these processes, the CRB motion and the motion of the plasma at the CRB are consistent only if a back and forth motion over a timescale of a few minutes is superimposed on a monotonic migration of the CRB over longer time periods.