Simulation of Plasmaspheric Plume Impact on Dayside Magnetic Reconnection
Simulation of Plasmaspheric Plume Impact on Dayside Magnetic Reconnection
复制标题
等离子体球羽流对日侧磁重联影响的模拟
DOI：
10.1029/2019gl086546
复制
发表时间：
2020
影响因子：
5.2
通讯作者：
F. Califano
中科院分区：
文献类型：
--
作者：
J. Dargent;N. Aunai;B. Lavraud;S. Toledo‐Redondo;F. Califano
在强磁活动期间，来自等离子层的冷致密等离子体通常会形成羽流，向白天的磁层顶延伸，最终到达它。在这项工作中，我们提出了一个大尺度的二维全动力学粒子细胞模拟，模拟了被传播的等离子体羽流撞击的磁层顶的重新连接。模拟过程经历了四个不同的阶段：初始非定常状态、地幔柱到达磁层顶前的稳定状态、地幔柱相互作用状态和地幔柱完全被重连点吞没后的稳定状态。我们展示了磁层顶动力学的演化受到等离子体的改变。我们的主要结果是，等离子体温度（羽流中的冷质子）的变化对磁重联率没有影响，磁重联率平均只取决于在撞击之前、期间和之后的流入磁场和总离子密度。
During periods of strong magnetic activity, cold dense plasma from the plasmasphere typically forms a plume extending toward the dayside magnetopause, eventually reaching it. In this work, we present a large‐scale two‐dimensional fully kinetic particle‐in‐cell simulation of a reconnecting magnetopause hit by a propagating plasmaspheric plume. The simulation is designed so that it undergoes four distinct phases: initial unsteady state, steady state prior to plume arrival at the magnetospause, plume interaction, and steady state once the plume is well engulfed in the reconnection site. We show the evolution of the magnetopause's dynamics subjected to the modification of the inflowing plasma. Our main result is that the change in the plasma temperature (cold protons in the plume) has no effects on the magnetic reconnection rate, which on average depends only on the inflowing magnetic field and total ion density, before, during, and after the impact.