lensing from small-scale travelling ionospheric disturbances observed using lofar

IF 3.4 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Journal of Space Weather and Space Climate Pub Date : 2022-09-01 DOI:10.1051/swsc/2022030

Ben Boyde, A. Wood, G. Dorrian, Richard A Fallows, D. Themens, J. Mielich, S. Elvidge, M. Mevius, P. Zucca, B. Dabrowski, A. Krankowski, C. Vocks, M. Bisi

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引用次数: 7

Abstract

Observations made using the LOw Frequency ARray (LOFAR) between 10:15 and 11:48 UT on the 15th of September 2018 over a bandwidth of approximately 25-65 MHz contain discrete pseudo-periodic features of ionospheric origin. These features occur with a period of approximately ten minutes and collectively last roughly an hour. They are strongly frequency dependent, broadening significantly in time towards the lower frequencies, and show an overlaid pattern of diffraction fringes. By modelling the ionosphere as a thin phase screen containing a wave-like disturbance, we are able to replicate the observations, suggesting that they are associated with small-scale travelling ionospheric disturbances (TIDs). This modelling indicates that the features observed here require a compact radio source at a low elevation, and that the TID or TIDs in question have a wavelength ~30 km. Several features suggest the presence of deviations from an idealised sinusoidal wave form. These results demonstrate LOFAR's capability to identify and characterise small-scale ionospheric structures.

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利用lofar观测到的小尺度电离层旅行扰动透镜

2018年9月15日10时15分至11时48分，使用LOw频率ARray（LOFAR）在大约25-65 MHz的带宽上进行的观测包含电离层起源的离散伪周期特征。这些特征出现的时间大约为十分钟，总共持续大约一个小时。它们强烈依赖于频率，随着时间的推移向较低频率显著加宽，并显示出衍射条纹的叠加图案。通过将电离层建模为包含波浪状扰动的薄相位屏，我们能够复制观测结果，表明它们与小规模旅行电离层扰动（TID）有关。该模型表明，这里观察到的特征需要在低海拔高度使用紧凑的无线电源，并且所讨论的TID或TID的波长约为30km。一些特征表明存在与理想正弦波形的偏差。这些结果证明了LOFAR识别和表征小规模电离层结构的能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Space Weather and Space Climate ASTRONOMY & ASTROPHYSICS-GEOCHEMISTRY & GEOPHYSICS

CiteScore

6.90

自引率

6.10%

发文量

审稿时长

8 weeks

期刊介绍： The Journal of Space Weather and Space Climate (SWSC) is an international multi-disciplinary and interdisciplinary peer-reviewed open access journal which publishes papers on all aspects of space weather and space climate from a broad range of scientific and technical fields including solar physics, space plasma physics, aeronomy, planetology, radio science, geophysics, biology, medicine, astronautics, aeronautics, electrical engineering, meteorology, climatology, mathematics, economy, informatics.