利用Murchison Widefield Array的电离层涨落功率谱分析
天体物理仪器与方法
2015-09-02 v1 空间物理
摘要
诸如Murchison Widefield Array (MWA)的低频宽视场（FoV）射电望远镜能够以高空间完备性对电离层采样。我们展示了MWA数据中电离层涨落的首次功率谱分析结果，其中我们检验了出现在两个数据集中的射电源的位置偏移。天体源位置的折射偏移与垂直于视线方向的电子柱密度的空间梯度成正比。这些可用于探测电离层中的等离子体结构和波。MWA探测的区域（10-100公里）尺度由其视场大小和射电源的空间密度（单个视场中通常有数千个）决定，补充了GPS研究的全球（100-1000公里）尺度和雷达散射测量的局部（0.01-1公里）尺度。我们的数据展现出一系列复杂的结构和波。一些涨落具有行进电离层扰动（TIDs）的特征，而另一些则呈沿地球磁场排列的狭窄、缓慢漂移带的形式。
引用
@article{arxiv.1506.01798,
title = {Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array},
author = {Shyeh Tjing Loi and Cathryn M. Trott and Tara Murphy and Iver H. Cairns and Martin Bell and Natasha Hurley-Walker and John Morgan and Emil Lenc and A. R. Offringa and L. Feng and P. J. Hancock and D. L. Kaplan and N. Kudryavtseva and G. Bernardi and J. D. Bowman and F. Briggs and R. J. Cappallo and B. E. Corey and A. A. Deshpande and D. Emrich and B. M. Gaensler and R. Goeke and L. J. Greenhill and B. J. Hazelton and M. Johnston-Hollitt and J. C. Kasper and E. Kratzenberg and C. J. Lonsdale and M. J. Lynch and S. R. McWhirter and D. A. Mitchell and M. F. Morales and E. Morgan and D. Oberoi and S. M. Ord and T. Prabu and A. E. E. Rogers and A. Roshi and N. Udaya Shankar and K. S. Srivani and R. Subrahmanyan and S. J. Tingay and M. Waterson and R. B. Wayth and R. L. Webster and A. R. Whitney and A. Williams and C. L. Williams},
journal= {arXiv preprint arXiv:1506.01798},
year = {2015}
}
备注
Accepted for publication in Radio Science