Application of the Tianwen-1 DOR Signals Observed by Very Long Baseline Interferometry Radio Telescopes in the Study of Solar Wind Plasma and a Coronal Mass Ejection
Application of the Tianwen-1 DOR Signals Observed by Very Long Baseline Interferometry Radio Telescopes in the Study of Solar Wind Plasma and a Coronal Mass Ejection
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DOI：
10.3847/1538-4365/ad077f
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发表时间：
2023-12
期刊：
影响因子：
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通讯作者：
Zhichao Wang;Maoli Ma;Qinghui Liu;Qingbao He;Xin Zheng;Lijia Liu;Guifré Molera Calvés
中科院分区：
文献类型：
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作者：
Zhichao Wang;Maoli Ma;Qinghui Liu;Qingbao He;Xin Zheng;Lijia Liu;Guifré Molera Calvés
天问一号火星探测器在2021年首次经历了太阳合。中国VLBI观测网（CVN）对TW 1的差分单向测距（DOR）信号进行了全程观测。本文探讨了CVN观测资料在太阳风等离子体研究中的应用。首先，使用多普勒方法计算每个站处的DOR载波和侧音的频率和相位。然后，使用侧音的相位计算微分相位延迟（DPD）和总电子含量（TEC）的变化。我们还统计分析了Delta-DOR（Δ DOR）群延迟的波动。结果表明，随着日心距的减小，TW 1信号的频率、相位、Δ DOR群延迟、延迟率和TEC变化的起伏增大。2021年11月2日，一次日冕物质抛射（CME）穿过望远镜光束的射线路径，当时火星投影位置的日心距离和日面纬度分别为30.6 Rs和3 °。我们的数据捕捉到了CME对DOR信号的影响。DPD的变化达到170 ps，相当于986 TECU。我们利用互相关分析了多站的频率起伏，得到了日冕物质抛射的传播方向和速度变化。我们的分析表明，甚长基线干涉测量站观测到的多频DOR信号在表征太阳风等离子体的电子密度变化和传播方面有很大的应用。
The Tianwen-1 (TW1) Mars probe experienced solar conjunction for the first time in 2021. The China VLBI Network (CVN) observes the differential one-way ranging (DOR) signals of TW1 throughout its phase. This paper explores the application of CVN observation data to study the solar wind plasma. First, the frequency and phase of the DOR carrier and sidetones at each station are calculated using the Doppler method. Then, the variations in both the differential phase delays (DPD) and the total electron content (TEC) are calculated using the phase of the sidetones. We also statistically analyze the fluctuations in the Delta-DOR (ΔDOR) group delay. The results indicate that the fluctuations of the frequency, phase, ΔDOR group delay, delay rate, and TEC variations of the TW1 signals increase with the decrease of the heliocentric distance. On 2021 November 2, a coronal mass ejection (CME) passed across the ray paths of the telescope beams, when the heliocentric distance and heliographic latitude of the projected position of Mars were 30.6 Rs and 3°, respectively. Our data catch the impact of the CME on the DOR signals. The change of the DPD reaches 170 ps, which is equivalent to 986 TECU. We utilize the cross correlation to analyze the frequency fluctuations at multiple stations, and obtain the propagation direction and velocity variations of the CME. Our analysis indicates that multifrequency DOR signals observed by very long baseline interferometry stations have great application to characterize the electron density variations and propagation of the solar wind plasma.