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Statistics of depleted flux tubes in the jovian magneto sphere

机译：木星磁层中耗尽的磁通管的统计

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On many of its passes through the Io torus the Galileo spacecraft has detected the presence of what appear to be thin magnetic flux tubes with fields somewhat higher than their surroundings. On these flux tubes the magnetic pressure is sufficiently above the pressure of neighboring tubes that it is possible the plasma contributions to the pressure within these tubes are depleted. Due to their short duration, they are only detectable in high time-resolution magnetometer data. Herein we survey all high time-resolution data that are available over the full Galileo mission and present a final statistical study. These tubes occupy 0.32% of the torus outside the orbit of Io. None are found inside. Their strength indicates that the ratio of the thermal pressure to magnetic pressure in the outer torus is about 2%. Comparison of the observed electron density in the neighborhood of these tubes indicates that the ion temperature is in the range 30-100 eV, consistent with other estimates. The amount of magnetic flux transported by these thin tubes could supply the amount of magnetic flux mass-loaded and transported to the magnetotail if the inward velocity is about 300 times that of the outward transport. Finally, the thin flux tubes are found in clusters, as they would occur if they resulted from the breakup of larger flux tubes.
机译：伽利略号航天器在多次穿过艾奥托圆环的过程中，发现了似乎是磁场强度比其周围环境略高的细磁通管的存在。在这些通量管上，磁压足够高于相邻管的压力，以至于等离子体对这些管内压力的贡献可能会被耗尽。由于持续时间短，因此只能在高分辨率的磁力计数据中检测到它们。在这里，我们调查了整个伽利略飞行任务中所有可用的高分辨率时间数据，并提出了最终的统计研究。这些电子管占据了Io轨道外环面的0.32％。里面没有发现。它们的强度表明外圆环中的热压与磁压之比约为2％。在这些管附近观察到的电子密度的比较表明，离子温度在30-100 eV的范围内，与其他估计值一致。如果向内速度是向外传输速度的300倍，则由这些细管传输的磁通量可以提供大量加载并传输至磁尾的磁通量。最终，发现细的通量管成簇出现，因为它们是由较大的通量管破裂而产生的。

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