CME-related Large Decreases in the Differential Phase Delay of Tianwen-1 DOR Signals

He, Qingbao; Wang, Zhichao; Liu, Qinghui; Liu, Kaijun; Guo, Lei

doi:10.3847/2041-8213/aca2a8

Cited by 3 publications

(26 citation statements)

References 23 publications

(17 reference statements)

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“…The Tianwen-1 Mars orbiter transmits DOR signals at five frequencies: 8411.8, 8427.2, 8431.0 (carrier), 8434.8, and 8450.2 MHz (He et al 2022;Liu et al 2022). In the present study, the differential phase delay between the DOR signals at 8411.8 MHz (the lowest frequency) and 8450.2 MHz (the highest frequency) is calculated.…”

Section: Observation Resultsmentioning

confidence: 99%

“…In the present study, the differential phase delay between the DOR signals at 8411.8 MHz (the lowest frequency) and 8450.2 MHz (the highest frequency) is calculated. The details of calculating the differential phase delay and the corresponding TEC change have been described in He et al (2021) and He et al (2022).…”

Section: Observation Resultsmentioning

confidence: 99%

“…This leads to temporal gaps in the differential phase delay calculated. The various scans of the differential phase delay (the thick line segments in Figure 1) have been connected by a linear fitting method as in He et al (2022). Thus, they may be slightly different from the true variation trends.…”

Section: Observation Resultsmentioning

confidence: 99%

“…Since then, the orbiter has been orbiting Mars (Zou et al 2021;Zhang et al 2022). A high gain antenna on board the orbiter kept transmitting differential one-way range (DOR) signals, which contain five spectral lines in the X band (∼ 8.4 GHz) and span a frequency range of 38.4 MHz (He et al 2022). The DOR signals are received by the Chinese very long baseline interferometry (VLBI) network for improving the accuracy of Tianwen-1ʼs orbit determination (Liu et al 2022;Yang et al 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Differential phase delay of the DOR signals can be used to deduce variations of the total electron content (TEC) along the signal path and thus provides information on the interplanetary solar wind plasma structures. Recently, He et al (2022) demonstrated that the DOR signals can detect corona mass ejections (CMEs) passing through the signal path in the interplanetary space. Besides CMEs, corotating interaction regions (CIRs) are also typical large-scale structures in the interplanetary solar wind.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Using Tianwen-1 Differential One-way Range Signals to Probe Corotating Interaction Regions: Case Studies

He,

Wang,

Liu

et al. 2023

ApJ

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The study reports the first detection of corotating interaction regions (CIRs) in the solar wind by the differential one-way range (DOR) signals transmitted by Tianwen-1. Differential phase delay is calculated for the DOR signals. Variations of the total electron content (TEC) along the signal path between Tianwen-1 and the ground stations are then derived from changes in the differential phase delay. Large TEC variations are found for 2021 February 11, 18, and 19 even after the influence from the Earth’s ionosphere has been removed. In situ solar wind measurements and the corresponding simulation results further show that the TEC variations are caused by the CIRs that passed through the signal path on these days. The study demonstrates that CIR structures can be probed using deep-space spacecraft range signals. Such measurements can be used to constrain global solar wind forecast models.

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Section: Observation Resultsmentioning

confidence: 99%

Section: Observation Resultsmentioning

confidence: 99%

Section: Observation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Using Tianwen-1 Differential One-way Range Signals to Probe Corotating Interaction Regions: Case Studies

He,

Wang,

Liu

et al. 2023

ApJ

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Large TEC Variations Between Mars and Earth: Simulation and Observation Comparisons

He,

Liu,

Wang

et al. 2024

JGR Space Physics

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Large total electron content (TEC) variations along the line from Mars to Earth have been demonstrated by analyzing the ground received Tianwen‐1 differential one‐way range (DOR) signals when corona mass ejections (CMEs) and co‐rotating interaction regions (CIRs) pass through the signal path. Here, the TEC variations along the line from Mars to Earth are calculated from the Wang‐Sheeley‐Arge (WSA)‐Enlil space weather forecast model. The results are compared with the Tianwen‐1 line of sight (LOS) observations as well as the STEREO‐A in situ solar wind density measurements. It is found that the TEC variations calculated from the WSA‐Enlil model are usually much smaller in amplitude, especially in the cases of CIRs passing through the signal path. In addition, the timings of CMEs and CIRs passing through the DOR signal path in the WSA‐Enlil model can be half a day earlier or later than the observed ones. In comparison with in situ solar wind measurements, the ground received Tianwen‐1 DOR signals carry solar wind density information over a large spatial region along the signal path. Such remote sensing measurement can be valuable for constraining and improving global solar wind forecast models.

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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

Wang,

Ma,

Liu

et al. 2023

ApJS

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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.

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CME-related Large Decreases in the Differential Phase Delay of Tianwen-1 DOR Signals

Cited by 3 publications

References 23 publications

Using Tianwen-1 Differential One-way Range Signals to Probe Corotating Interaction Regions: Case Studies

Using Tianwen-1 Differential One-way Range Signals to Probe Corotating Interaction Regions: Case Studies

Large TEC Variations Between Mars and Earth: Simulation and Observation Comparisons

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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