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Ionospheric effects in VLBI measured with space-ground interferometer RadioAstron
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-07-05 , DOI: 10.1093/mnras/stab1921
M V Popov 1 , N Bartel 2 , M S Burgin 1 , T V Smirnova 3 , V A Soglasnov 1
Affiliation  

We report on slow phase variations of the response of the space-ground radio interferometer RadioAstron during observations of pulsar B0329+54. The phase variations are due to the ionosphere and clearly distinguishable from effects of interstellar scintillation. Observations were made in a frequency range of 316–332 MHz with the 110-m Green Bank Telescope and the 10-m RadioAstron telescope in 1-h sessions on 2012 November 26, 27, 28, and 29 with progressively increasing baseline projections of about 60, 90, 180, and 240 thousand kilometres. Quasi-periodic phase variations of interferometric scintles were detected in two observing sessions with characteristic time-scales of 12 and 10 min and amplitudes of up to 6.9 radians. We attribute the variations to the influence of medium-scale Travelling Ionospheric Disturbances. The measured amplitude corresponds to variations in vertical total electron content in ionosphere of about $0.1\times 10^{16}\, \text{m}^{-2}$. Such variations would noticeably constrain the coherent integration time in VLBI studies of compact radio sources at low frequencies.

中文翻译:

用天地干涉仪 RadioAstron 测量的 VLBI 中的电离层效应

我们报告了在观测脉冲星 B0329+54 期间空地无线电干涉仪 RadioAstron 响应的缓慢相位变化。相位变化是由于电离层造成的,并且可以明显区别于星际闪烁的影响。在 2012 年 11 月 26 日、27 日、28 日和 29 日的 1 小时会议中,使用 110 米绿岸望远镜和 10 米 RadioAstron 望远镜在 316-332 MHz 的频率范围内进行了观测,基线预测逐渐增加约60、90、180 和 24 万公里。干涉闪烁体的准周期相位变化在两个观测时段中检测到,特征时间尺度为 12 和 10 分钟,幅度高达 6.9 弧度。我们将这些变化归因于中等规模旅行电离层扰动的影响。测量的幅度对应于电离层中垂直总电子含量的变化,约为 $0.1\times 10^{16}\, \text{m}^{-2}$。这种变化将显着限制低频紧凑无线电源的 VLBI 研究中的相干积分时间。
更新日期:2021-07-05
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