RADIAL VELOCITY ALONG THE VOYAGER 1 TRAJECTORY: THE EFFECT OF SOLAR CYCLE
RADIAL VELOCITY ALONG THE VOYAGER 1 TRAJECTORY: THE EFFECT OF SOLAR CYCLE
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DOI：
10.1088/2041-8205/750/1/l4
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
N. Pogorelov;S. Borovikov;G. Zank;L. Burlaga;R. Decker;E. Stone
中科院分区：
文献类型：
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作者：
N. Pogorelov;S. Borovikov;G. Zank;L. Burlaga;R. Decker;E. Stone
随着旅行者一号和旅行者二号接近日光层顶（HP）——太阳风（SW）和当地星际介质（LISM）之间的边界——我们预计日光层界面新的、未知的特征将会被揭示。 Krimigis 等人最近报告了一个看似谜题的问题。涉及源自高能离子分布的异常低甚至负的径向速度分量。内日鞘 (IHS) 的稳态等离子体模型表明，即使在 HP 表面，径向速度也不应为零。在这里，我们证明 Voyager 1 观测到的速度分布与 SW-LISM 相互作用的时间相关模拟一致。在这封信中，我们分析了包含太阳周期效应的大型日光层数值模型的结果。我们的模拟表明，距离 HP 很远的 IHS 中可能存在长时间的低至负径向速度。研究还表明，航海者 1 号比航海者 2 号更有可能观察到这些区域。
As Voyager 1 and Voyager 2 are approaching the heliopause (HP)—the boundary between the solar wind (SW) and the local interstellar medium (LISM)—we expect new, unknown features of the heliospheric interface to be revealed. A seeming puzzle reported recently by Krimigis et al. concerns the unusually low, even negative, radial velocity components derived from the energetic ion distribution. Steady-state plasma models of the inner heliosheath (IHS) show that the radial velocity should not be equal to zero even at the surface of the HP. Here we demonstrate that the velocity distributions observed by Voyager 1 are consistent with time-dependent simulations of the SW–LISM interaction. In this Letter, we analyze the results from a numerical model of the large-scale heliosphere that includes solar cycle effects. Our simulations show that prolonged periods of low to negative radial velocity can exist in the IHS at substantial distances from the HP. It is also shown that Voyager 1 was more likely to observe such regions than Voyager 2.