Detection of Strongly Turbulent Regions in the Supercorona with the Venus Express and Mars Express Satellites

Efimov, A. I.; Луканина, Л. А.; Смирнов, В. М.; Чашей, И. В.; Bird, M. K.; Paëtzold, M.

doi:10.1134/s001679322103004x

Cited by 4 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the radio signals of spacecraft can enter the challenging inner solar wind within 10 solar radii (Rs, 1 Rs = 695,700 km), solar conjunction observation of deep-space probes is a common research method to study the coronal structure. This technique was used by Akatsuki to show the difference in the solar-wind velocity between fast and slow winds (Chiba et al 2022), by Galileo to study the outer turbulence scale of the solar wind (Efimov et al 2002), by Venus Express to detect the strong turbulence regions in the super corona (Efimov et al 2021), by Mars Express to study the interplanetary plasma scintillation between the years 2013(Molera Calvés et al 2017Kummamuru et al 2023), by the Mercury Surface, Space Environment, Geochemistry, and Ranging spacecraft to study radio Faraday rotation through a CME (Jensen et al 2018), and in Tianwen-1 (TW1) to detect the oscillation and propagation of the nascent dynamic solar wind structure (Ma et al 2022).…”

Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract