Correlation between energetic ion enhancements and heliospheric current sheet crossings in the outer heliosphere
Correlation between energetic ion enhancements and heliospheric current sheet crossings in the outer heliosphere
复制标题
高能离子增强与日光层外层电流片穿越之间的相关性
DOI：
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发表时间：
2006
影响因子：
5.2
通讯作者：
Y. Liu
中科院分区：
文献类型：
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作者：
J. Richardson;J. Richardson;E. Stone;A. Cummings;J. Kasper;M. Zhang;L. Burlaga;N. Ness;Y. Liu
旅行者1号和2号在终止激波（TS）上游的前震区域观察到高度可变的高能离子束。在旅行者2号（V2）上，离子强度通常与等离子体性质无关。在旅行者1号（V1）上，光束经常与日光层电流片（HCS）的交叉点重合。当HCS从负磁极性交叉到正磁极性并且V1在TS的几个Au内时，出现V1强度峰。两种机制被认为是：电流片漂移和流的离子从TS沿着磁场线是平行于HCS。目前的片漂移假说预测，在V2观测到的增强将发生在HCS在相反的方向交叉时，从正到负的磁极，因为V2是在南部的日纬度。
Voyagers 1 and 2 observed highly‐variable beams of energetic ions in the foreshock region upstream of the termination shock (TS). At Voyager 2 (V2), the ion intensities are generally not related to the plasma properties. At Voyager 1 (V1), the beams are often coincident with crossings of the heliospheric current sheet (HCS). The V1 intensity peaks occur when the HCS is crossed from negative to positive magnetic polarities and V1 is within a few AU of the TS. Two mechanisms are considered: current sheet drift and streaming of ions from the TS along magnetic field lines which are parallel to the HCS. The current sheet drift hypothesis predicts that enhancements observed at V2 will occur when the HCS is crossed in the opposite direction, from positive to negative magnetic polarity, since V2 is at southern heliolatitudes.