Relationship of dayside auroral precipitations to the open‐closed separatrix and the pattern of convective flow
Relationship of dayside auroral precipitations to the open‐closed separatrix and the pattern of convective flow
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DOI：
10.1029/97ja01100
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发表时间：
1997-08
影响因子：
--
通讯作者：
M. Lockwood
中科院分区：
文献类型：
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作者：
M. Lockwood
的影响进行了讨论的磁层离子的加速反射关闭两个磁层顶阿尔芬波，发射的重连网站到流入区域的边界两侧。使用洛克伍德等人[1996]描述的模型预测的这些波对离子总数的影响，提供了对向阳面电离层中所有各种广泛使用的降水分类的物理解释，即中央等离子体片、向阳面边界等离子体片（BPS）、空洞、低纬度边界层（LLBL）、尖点、地幔和极帽。开闭边界的位置和对流流型的形式进行了讨论的区域中，这些不同的降水是典型的foundations.Specifically，该模型预测，LLBL和向阳面BPS降水是在新开的磁力线和地方的LLBL内的对流反转，经常观察到的。它示出，这提供了解决方案的一些悖论和问题，出现如果LLBL和BPS沉淀被认为是封闭的场线。该模型还被用来对尖点的经度范围和纬度宽度作为太阳风密度的函数进行定量预测。
The implications are discussed of acceleration of magnetospheric ions by reflection off two magnetopause Alfven waves, launched by the reconnection site into the inflow regions on both sides of the boundary. The effects of these waves on the ion populations, predicted using the model described by Lockwood et al. [1996], offer a physical interpretation of all the various widely used classifications of precipitation into the dayside ionosphere, namely, central plasma sheet, dayside boundary plasma sheet (BPS), void, low-latitude boundary layer (LLBL), cusp, mantle, and polar cap. The location of the open-closed boundary and the form of the convection flow pattern are discussed in relation to the regions in which these various precipitations are typically found. Specifically, the model predicts that both the LLBL and the dayside BPS precipitations are on newly opened field lines and places the convection reversal within the LLBL, as is often observed. It is shown that this offers solutions to a number of paradoxes and problems that arise if the LLBL and BPS precipitations are thought of as being on closed field lines. This model is also used to make quantitive predictions of the longitudinal extent and latitudinal width of the cusp, as a function of solar wind density.