Using a three‐dimensional (3‐D) global‐scale hybrid code, the Magnetospheric Multiscale (MMS) reconnection event around 02:13 UT on 18 November 2015, highlighted in the Geospace Environment Modeling (GEM) Dayside Kinetic Challenge, is simulated, in which the interplanetary magnetic field (IMF) points southward and the geomagnetic field has a −27° dipole tilt angle. Strong southward plasma jets are found near the magnetopause as a result of the dayside reconnection. Our results indicate that the subsolar magnetopause reconnection X line shifts from the subsolar point toward the Northern Hemisphere due to the effect of the tilted geomagnetic dipole angle, consistent with the MMS observation. Subsequently, the reconnection X lines or sites and reconnection flux ropes above the equator propagate northward along the magnetopause. The formation and global distribution of the X lines and the structure of the magnetopause reconnection are investigated in detail with the simulation. Mirror mode waves are also found in the middle of the magnetosheath downstream of the quasi‐perpendicular shock where the plasma properties are consistent with the mirror instability condition. As a special outcome of the GEM challenge event, the spatial and temporal variations in reconnection, the electromagnetic power spectra, and the associated D‐shaped ion velocity distributions in the simulated reconnection event are compared with the MMS observation.

中文翻译：

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IMF向南条件下偶极倾斜影响的更年期磁重合：混合模拟和MMS观测

使用三维（3D）全球尺度混合代码，模拟了2015年11月18日UT 02:13 UT附近的磁层多尺度（MMS）重新连接事件，该事件在地理空间环境建模（GEM）白天动力学挑战赛中得到了强调，其中，行星际磁场（IMF）指向南，地磁场具有-27°偶极子倾斜角。由于日间重新连接，在磁层顶附近发现了强烈的向南等离子流。我们的结果表明，由于倾斜的地磁偶极子角的影响，太阳下磁层顶重新连接X线从太阳下点向北半球移动，这与MMS观测结果一致。随后，重新连接的X线或位置和赤道上方的重新连接通量绳沿着磁层顶向北传播。通过仿真，详细研究了X线的形成和整体分布以及磁层顶重新连接的结构。镜模式波也出现在准垂直冲击的下游磁石中部，其等离子体性质与镜的不稳定性条件一致。作为GEM挑战事件的特殊结果，将模拟重新连接事件中重新连接的时空变化，电磁功率谱以及相关的D形离子速度分布与MMS观测结果进行了比较。镜模式波也出现在准垂直冲击的下游磁石中部，那里的等离子体性质与镜的不稳定性条件一致。作为GEM挑战事件的特殊结果，将模拟重新连接事件中重新连接的时空变化，电磁功率谱以及相关的D形离子速度分布与MMS观测结果进行了比较。镜模式波也出现在准垂直冲击的下游磁石中部，那里的等离子体性质与镜的不稳定性条件一致。作为GEM挑战事件的特殊结果，将模拟重新连接事件中重新连接的时空变化，电磁功率谱以及相关的D形离子速度分布与MMS观测结果进行了比较。