Elucidation of Magnetospheric Magnetic Topology Bifurcation by Numerical Simulations

我们用数值磁流体模拟的方法研究了太阳风-磁层相互作用，并从磁拓扑的角度考察了磁通量循环(等离子体对流)。我们发现了一种新的磁通循环模式，它的运行方式与之前预期的不同。环流模式是由开放地磁力线和闭合地磁力线之间的磁重连接驱动的。根据行星际磁场的方向和地球的S偶极子轴的不同，出现了不同的图案。这一新的磁通量循环概念成功地解释了以往报道的电离层对流模式。

We investigated the solar wind-magnetosphere interaction using numerical magnetohydrodynamic simulation and examined the magnetic flux circulation(plasma convection) from a point of view of magnetic topology. We found a new magnetic flux circulation mode operating that is different from the one previously expected. The circulation mode is driven by magnetic re connection between open and closed geomagnetic field lines. There are various appearance patterns depending on the directions of the interplanetary magnetic field and the Earth' s dipole axis. Ionospheric convection patters reported in the past are successfully explained by this new idea of magnetic flux circulation.