标题： 日光层之外旅行者号磁场中的间歇性 显示英文标题

标题： Intermittency in Voyager Magnetic Field Beyond the Heliosphere

摘要： 当两艘旅行者号航天器穿越日球层之外时，它们遇到了一种以前从未观测到的磁场环境。 研究尝试通过检查磁场的间歇性来描述这一新领域。 通常的做法是拟合最优的kappa分布函数，并解释所谓的q统计量以表征磁场增量。 使用这种方法，最近的研究得出结论，在某个距离之外，非常局部星际介质（VLISM）中的磁场增量遵循高斯统计，而与日球层内部以及广泛接受的日球层边界区域之外的磁场增量不同，这引发了关于日球层边界的识别问题。 本研究通过（1）优化分布函数的推导，（2）检查结果是否以及如何依赖于增量窗口和时间周期，以及（3）确定所检查时间序列的统计行为，详细探讨了这一问题。 利用旅行者1号的磁场测量数据，我们提出了两种独立的技术，并引入了一种统计框架，以系统地分析磁场增量的分布。 与之前的发现相反，我们发现VLISM中的磁场增量并不遵循高斯分布（k趋于无穷大），而是处于非高斯范围的kappa值（3-7，当在30天的统计周期下进行分析时）。 我们进一步展示了在这样的分析中混合不同结构时，如何产生错误的、由统计引起的看似高斯的结果。 我们的结果表明，旅行者1号仍然在VLISM的间歇性磁场环境中行驶。 显示英文摘要

摘要： As the two Voyager spacecraft traveled beyond the heliosphere, they encountered a magnetic field environment that had never been observed before. Studies have attempted to characterize this new regime by examining the magnetic field intermittency. This is typically done by fitting the optimal kappa distribution function and interpreting its so-called q-statistics to characterize the magnetic field increments. Using this approach, recent findings concluded that beyond a certain distance, the magnetic field increments in the very local interstellar medium (VLISM) follow Gaussian statistics, unlike those both inside the heliosphere and in the region just beyond the widely accepted heliopause location, raising questions about the heliopause identification. This study explores this issue in detail by (1) optimizing the derivation of the distribution function, (2) examining whether and how the results depend on increment windows and time periods, and (3) determining the statistical behavior of the examined time series. Using magnetic field measurements from Voyager 1, we present two independent techniques and introduce a statistical framework to systematically analyze the distributions of magnetic field increments. Contrary to previous findings, we find that magnetic field increments in the VLISM do not follow a Gaussian distribution (k to infinity) and instead are in the non-Gaussian range of kappa values (3-7, when analyzed on a 30-day statistical period). We further demonstrate how erroneous, statistically induced results can arise that mimic Gaussian-like results when mixing different structures in such analyses. Our results show that Voyager 1 still travels in the intermittent magnetic field environment of the VLISM.