Interaction between inclined current sheets and the heliospheric termination shock
Interaction between inclined current sheets and the heliospheric termination shock
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倾斜电流片与日光层终止激波之间的相互作用
DOI：
10.1029/2010gl044656
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发表时间：
2010
影响因子：
5.2
通讯作者：
Giacalone J
中科院分区：
文献类型：
--
作者：
Giacalone J
利用二维混合模拟方法，我们研究了日球电流片（HCS）和太阳风终端激波（TS）之间的相互作用。热流异常（HFA）是在激波和电流片的交叉处可能形成的热的、偏转的和扰动的等离子体流区域。我们研究了电流片相对于激波法线的倾角θCn所起的作用。如前所述，低θ Cn值与HFA的形成有关。我们发现，随着θ Cn的增加，HFA发生变化，直到θCn= 60°时，HFA完全消失。因此，由于HCS相对于径向方向高度倾斜（θCn> 60°），因此不太可能在TS附近形成HFA。我们还发现，一些超热粒子，特别是星际皮卡离子，被困在附近的冲击和电流片的交点，在那里他们获得相当大的能量，并随后沿着冲击上游的电流片漂移。这个过程对于θCn的较大值更为有效。因此，我们预计TS的上游可能存在与HCS交叉相关的高能粒子（通电拾取离子），但仅具有与HFA相关的特定磁反转极性。这可能与最近报道的旅行者观测有关。
Using two‐dimensional hybrid simulations we study the interaction between the Heliospheric Current Sheet (HCS) and the solar wind termination shock (TS). Hot flow anomalies (HFA) are regions of hot, deflected and disturbed plasma flow which may form at the intersection of a shock and current sheet. We study the role played by the inclination, θCn, of the current sheet relative to the shock normal. As previously found, low values of θCnare associated with HFA formation. We find that as θCnincreases the HFA is modified, until at θCn= 60° it disappears completely. Thus, HFAs are unlikely to be formed near the TS since the HCS is highly inclined relative to the radial direction (θCn> 60°). We also find that some suprathermal particles, particularly interstellar pickup ions, are trapped near the intersection point of the shock and current sheet where they gain considerable energy, and subsequently drift along the current sheet upstream of the shock. This process is more effective for larger values of θCn. Thus, we expect that upstream of the TS there are likely to be high‐energy particles (energized pickup ions) associated with crossings of the HCS, but only of the particular magnetic reversal polarity associated with HFAs. This may be relevant to recently reported Voyager observations.
高能离子增强与日光层外层电流片穿越之间的相关性
影响因子：
5.2
作者：
J. Richardson;J. Richardson;E. Stone;A. Cummings;J. Kasper;M. Zhang;L. Burlaga;N. Ness;Y. Liu
通讯作者：
Y. Liu