Along-track Calibration of the Zhurong Rover Magnetometer

Luo, Hao; Du, Aimin; Ge, Yasong; Zhang, Ying; Li, Haiying; Tian, Lin; Zhang, Kuixiang; Sun, Shuquan; Zhao, Lin; Li, Zhi; Feng, Xiao

doi:10.1007/s11430-023-1213-1

Cited by 1 publication

(2 citation statements)

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“…InSight has made the first surface magnetic fields observation for about a whole Martian year (Mittelholz et al, 2023). Zhurong magnetometer conducted the magnetic survey for more than 1.9 km in the Utopia basin (Du et al, 2023;Luo et al, 2024). Unfortunately, due to the limited exploration duration at each location (∼40 min), it is difficult to determine an accurate external magnetic field on the Martian surface from Zhurong magnetometer.…”

Section: Discussionmentioning

confidence: 99%

“…Using Natural Orthogonal Component Analysis of the daily magnetic variations at the Martian surface from also InSight observations, Luo et al (2022a) studied the source of the variations at different time scales and found that the seasonal variations primarily appear in the first eigenmode and may be due to the wind-driven dynamo current variations in the ionospheric parameters with the same time scales. The Carrington and sub-Carrington rotation periodicities appear in the higher eigenmodes and can be due primarily to variations of the dynamo currents caused by the variations of the electron density in the Martian ionosphere and draped interplanetary magnetic field with the same period ,Luo et al, 2024.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the Ionospheric Dynamo Current of Mars Above InSight and Zhurong Landing Sites: A Modeling Study

Luo,

Tian,

et al. 2024

JGR Space Physics

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Previous observational studies suggest that the surface time‐varying magnetic field of Mars originates in large part from the dynamo currents in the Martian ionosphere. However, whether there are significant differences in the strength, configuration, diurnal, and seasonal variations of the dynamo currents above different regions need to be further studied. In this study, using the ionospheric parameters from Mars Climate Database version 5.3 (MCD v5.3) and 7 years of MAVEN magnetic field measurements, we compare the ionospheric dynamo currents above the landing sites of InSight (4.50°N, 135.62°E) and Zhurong (25.07°N, 109.90°E) and the resulting surface magnetic variations at the two landing sites by conducting a modeling study. We find that the average dynamo current as well as its diurnal magnetic field amplitude on the Martian surface is significantly stronger at InSight than that at Zhurong due to the stronger background magnetic field strength and more perpendicular angle between magnetic field and neutral wind vectors in the dynamo region, though the conductivities is always weaker over InSight landing site. The seasonal variation of the current intensity (represented by differences between northern winter and summer solstices) is prominent over InSight than that over Zhurong because the heliospheric distance effect‐resulted conductivity difference is the dominate factor for the seasonal variations over InSight while both the heliospheric distance and solar zenith angle (SZA) contribute to the current intensity at different Ls over Zhurong. The two factors partially offset each other and lead to a smaller seasonal variation. The role of crustal field, as well as the latitude effects on dynamo currents is also discussed. This study provides an attempt to promote the understanding of the solar wind‐induced magnetosphere‐ionosphere‐surface coupling process.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%