当行星际磁场有大的南向分量时，磁层的位形可由基本闭式转变为开式。
The magnetospheric configuration is converted from the nearly closed one into an open one, when the IMF has a large southward component.
在磁层昼侧，若imf有南向分量，也就是和北向的地球磁场方向相反，则磁力线重连的效率最高。
Reconnection is most efficient when the IMF has a component that is directed southward-that is, opposite to the northward direction of the earth's magnetic field at the dayside of the magnetosphere.
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