A magnetospheric generator driving ion and electron acceleration and electric currents in a discrete auroral arc observed by Cluster and DMSP
A magnetospheric generator driving ion and electron acceleration and electric currents in a discrete auroral arc observed by Cluster and DMSP
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Cluster 和 DMSP 观测到的离散极光弧中驱动离子和电子加速和电流的磁层发生器
DOI：
10.1029/2009gl038343
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发表时间：
2009
影响因子：
5.2
通讯作者：
J. D. Keyser
中科院分区：
文献类型：
--
作者：
M. Echim;R. Maggiolo;M. Roth;J. D. Keyser
2001年4月28日，Cluster和DMSP-F14的同时观测揭示了一个稳定的离散极光弧和场向加速电子和离子的通量，与黄昏区4.5 RE高度的磁层等离子体界面一致。我们比较了卫星数据与准静态磁层电离层耦合模型的基础上的磁层发电机的弗拉索夫解决方案。该模型提供了一个自洽的磁层电势匹配集群的观测。电离层电位是从电流连续性方程导出的，并给出了与DMSP数据一致的场向电位降和沉淀能量通量。模型结果和数据分析表明，极光电子和离子与磁层发生器的准稳态场向加速。我们将发生器与等离子体片边界层与波瓣的界面处或低纬边界层内缘处的会聚垂直电场联系起来。
Simultaneous observations on April 28, 2001 by Cluster and DMSP‐F14 reveal a stable discrete auroral arc and fluxes of field‐aligned accelerated electrons and ions coincident with a magnetospheric plasma interface at an altitude of 4.5 RE in the dusk sector. We compare satellite data with a quasi‐stationary magnetosphere‐ionosphere coupling model based on a Vlasov solution for the magnetospheric generator. The model provides a self‐consistent magnetospheric electric potential matching the Cluster observations. The ionospheric potential is derived from the current continuity equation and gives a field‐aligned potential drop and a flux of precipitating energy in agreement with the DMSP data. Model results and data analysis suggest a quasi‐stationary field‐aligned acceleration of auroral electrons and ions with a magnetospheric generator. We associate the generator with the convergent perpendicular electric field at the interface of the plasma sheet boundary layer with the lobe or at the inner edge of the low latitude boundary layer.