A local Martian crustal field model: Targeting the candidate landing site of the 2020 Chinese Mars Rover

IF 2.9 3区 地球科学
XinZhou Li, ZhaoJin Rong, JiaWei Gao, Yong Wei, Zhen Shi, Tao Yu, WeiXing Wan
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引用次数: 3

Abstract

Unlike Earth, Mars lacks a global dipolar magnetic field but is dominated by patches of a remnant crustal magnetic field. In 2021, the Chinese Mars Rover will land on the surface of Mars and measure the surface magnetic field along a moving path within the possible landing region of 20°W–50°W, 20°N–30°N. One scientific target of the Rover is to monitor the variation in surface remnant magnetic fields and reveal the source of the ionospheric current. An accurate local crustal field model is thus considered necessary as a field reference. Here we establish a local crust field model for the candidate landing site based on the joint magnetic field data set from Mars Global Explorer (MGS) and Mars Atmosphere and Volatile Evolution (MAVEN) data combined. The model is composed of 1,296 dipoles, which are set on three layers but at different buried depths. The application of the dipole model to the joint data set allowed us to calculate the optimal parameters of their dipoles. The calculated results demonstrate that our model has less fitting error than two other state-of-the art global crustal field models, which would indicate a more reasonable assessment of the surface crustal field from our model.

火星局部地壳场模型:以2020年中国火星车候选着陆点为目标
与地球不同的是,火星没有全球性的偶极磁场,而是由残余的地壳磁场组成。2021年,中国火星车将在火星表面着陆,并在20°W - 50°W, 20°N - 30°N可能着陆区域内沿移动路径测量火星表面磁场。火星车的一个科学目标是监测火星表面残余磁场的变化,揭示电离层电流的来源。因此,一个精确的局部地壳场模型被认为是必要的。本文基于火星全球探测器(MGS)联合磁场数据集和火星大气与挥发物演化(MAVEN)数据集,建立了候选着陆点的局部地壳场模型。该模型由1296个偶极子组成,它们被设置在三层,但埋深不同。将偶极子模型应用于联合数据集,可以计算出它们的最优偶极子参数。计算结果表明,该模型的拟合误差小于现有的两种全球地壳场模型,表明该模型对地表地壳场的评价更为合理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Earth and Planetary Physics
Earth and Planetary Physics GEOSCIENCES, MULTIDISCIPLINARY-
自引率
17.20%
发文量
174
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