利用信使号数据观测水星太阳风的1/f噪声

Rayta A. Pradata, Sohom Roy, William H. Matthaeus, Jiaming Wang, Rohit Chhiber, Francesco Pecora and Yan Yang
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引用次数: 0

摘要

在行星际介质中检测到具有带限尺度不变功率或“1/f”噪声的低频信号,并从日冕和光球观测中推断出来。它们的起源仍在争论中,主要问题是信号是来自局部过程还是来自太阳,可能来自尺度不变结构的叠加。探测到频率低至10 - 6 Hz的星际信号,距离在1 au以内,这对于理解这一现象很重要,但由于缺乏必要的长时间数据记录,这是具有挑战性的。在这里,我们使用信使号宇宙飞船的磁场数据,经过处理以去除水星的尾流,来分析一年来数据的光谱。1/f信号被检测到最低的期望频率,与观测到的相关时间的对数正态分布和Machlup-Montroll-Shlesinger叠加原理一致。这支持了一个假设,即观测到的1/f信号起源于太阳过程,可能是发电机,并且不利于局部原位发电,如W. H. Matthaeus和M. L. Goldstein和W. H. Matthaeus等人所描述的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observations of 1/f Noise at Mercury’s Solar Wind Using MESSENGER Data
Low-frequency signals having a band-limited scale-invariant power, or “1/f” noise, have been detected in the interplanetary medium and inferred from coronal and photospheric observations. Their origin remains under debate, with the principal issue being whether the signal originates from local processes or has a solar origin, possibly emerging from a superposition of scale-invariant structures. Detection of such interplanetary signals at frequencies as low as a few times 10−6 Hz at distances well within 1 au is important in developing an understanding of this phenomenon, but this is challenging due to a lack of the requisite long-duration data records. Here, we employ magnetic field data from the MESSENGER spacecraft, processed to remove Mercury’s wake, to analyze spectra from a year of data. The 1/f signal is detected down to the lowest expected frequencies, consistent with the observed lognormal distribution of correlation times and the Machlup–Montroll–Shlesinger superposition principle. This supports the hypothesis that the observed 1/f signals have an origin in solar processes, possibly the dynamo, and disfavors local in situ generation, as described in W. H. Matthaeus & M. L. Goldstein and W. H. Matthaeus et al.
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