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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Current-produced magnetic field effects on current collection
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Current-produced magnetic field effects on current collection

机译：电流产生的磁场对电流收集的影响

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Current collection by an infinitely long, conducting cylinder in a magnetized plasma, taking into account the magnetic field of the collected current, is discussed. A region of closed magnetic surfaces disconnects the cylinder from infinity. Owing to this, the collected current depends on the ratio between this region and the plasma sheath region and, under some conditions, current reduction arises. It is found that the upper bound limit of current collection is reduced due to this change of magnetic field topology. The effect can be substantial even if the orbit-limited model of current collection is valid. This model is used to find the reduction of the total current collected by a cylinder (e.g., a bare tether). It is shown that this effect strongly depends on plasma density. The results are applied to a tether system in the ionosphere, and it is found that current reduction can be significant for long tethers in typical dayside ionospheric conditions. [References: 22]
机译：讨论了无限长的导电圆柱体在磁化等离子体中进行的电流收集，同时考虑了收集到的电流的磁场。封闭的磁性表面区域使圆柱与无限远断开。因此，所收集的电流取决于该区域与等离子体鞘区域之间的比率，并且在某些情况下会引起电流减小。发现由于磁场拓扑结构的这种改变，电流收集的上限降低了。即使当前集合的轨道受限模型有效，其效果也可能很大。该模型用于查找气缸（例如，裸绳）收集的总电流的减少量。结果表明，这种效应在很大程度上取决于血浆密度。该结果应用于电离层中的系链系统，发现在典型的日间电离层条件下，长系绳的电流减小可能非常显着。 [参考：22]

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