Solar wind electric field driving of magnetospheric activity: Is it velocity or magnetic field?

Pulkkinen TI; Goodrich CC; Lyon JG

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Solar wind electric field driving of magnetospheric activity: Is it velocity or magnetic field?

机译：磁层活动的太阳风电场驱动：是速度还是磁场？

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The Lyon- Fedder- Mobarry global magnetohydrodynamic simulation code is used to examine a period of steady magnetospheric convection driven by a moderately southward IMF and a steady and quite low solar wind speed. Two other runs were performed to test the effects of increasing solar wind driving: one with 50% increase in the IMF magnitude and one with 50% increase in the solar wind speed. Larger IMF magnitude leads to nightside reconnection closer to the Earth but the steady state of the magnetotail is not changed. On the other hand, higher solar wind speed enhances Earthward mass and Poynting flux transport as well as their variability. The increase in the solar wind E-Y is the same for both runs, but the EY in the magnetosheath is larger in the run in which the speed is enhanced, which is associated with the higher magnetotail activity in that simulation.

机译：Lyon-Fedder-Mobarry全球磁流体动力学模拟代码用于检查由中等IMF向南和太阳风稳定且低速驱动的稳定磁层对流周期。进行了另外两次运行以测试增加太阳风驱动的效果：一次IMF幅度增加50％，另一次IMF幅度增加50％。较大的IMF幅度会导致夜间重新连接到更接近地球的位置，但磁尾的稳态不会改变。另一方面，更高的太阳风速会增加地球向质量和坡印丁通量传输以及它们的可变性。两次运行中太阳风E-Y的增加是相同的，但是在提高速度的运行中，磁石场的EY较大，这与该模拟中较高的磁尾活动有关。

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《Geophysical Research Letters》 |2007年第21期|共4页
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Pulkkinen TI; Goodrich CC; Lyon JG;
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Solar wind electric field driving of magnetospheric activity: Is it velocity or magnetic field?

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