电离层参数波动测量的光谱指数估算方法

IF 1.8 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
G. Fornari , F.C. de Meneses , R.R. Rosa , Esfhan A. Kherani , S. Domingos
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引用次数: 0

摘要

尽管信号功率谱密度(PSD)的可视化表示在拟合程序和识别断点时往往是模糊不清的来源,但光谱分析是一种主要用于根据现场测量结果研究电离层等离子体不规则性的尺度大小机制的技术。在这项工作中,我们提出了一种方法来减少这一过程中固有的不确定性。在此,我们使用去趋势波动分析法(DFA)来研究时间序列波动的频谱行为。DFA 算法是一种缩放分析程序,广泛应用于估计检测长程相关性,而不考虑明显的短程相关性。此外,DFA 技术还能去除信号中隐含的趋势,并适用于非稳态时间序列。利用对电离层电子密度和电场波动的现场测量,能够分析尺度从 1.66 千米到 12.4 米的等离子气泡。另一方面,光谱显示出包裹中等尺度的陡峭斜坡,这也是其他研究发现的一个特征。此外,与傅立叶光谱相比,DFA 的噪声较小,可以更精确地确定光谱断点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A methodology for estimating spectral indices to fluctuation measurements of ionospheric parameters

Spectral analysis is a technique largely used to study scale size regime of ionospheric plasma irregularities based on in situ measurements, notwithstanding the visual representation of power spectral density (PSD) of a signal is often a source of ambiguity during fitting routines and identification of breakpoints. In this work, a method is proposed in order to mitigate the uncertainties inherent to this process. Here, the spectral behavior of time series fluctuations is alternatively investigated using Detrended Fluctuation Analysis (DFA). The DFA algorithm is a scaling analysis procedure widely applied to estimate the detection of long-range correlation without considering apparent short-range ones. Furthermore, the DFA technique is able to remove trends implicit to the signal and to be applied to non-stationary time series. Using in situ measurements of both ionospheric electron density and electric field fluctuations, it was able to analyze plasma bubbles with scales ranging from 1.66 km to 12.4 m. The results show that DFA and PSD routines provide quite similar spectra, but different spectral indices. On the other hand, the spectra revealed steep slopes wrapping the medium scales, a characteristic also detected in other studies. Besides that, the DFA is less noisy than Fourier spectra, which allows a more precise identification of spectral breakpoints.

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来源期刊
Journal of Atmospheric and Solar-Terrestrial Physics
Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理
CiteScore
4.10
自引率
5.30%
发文量
95
审稿时长
6 months
期刊介绍: The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.
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