天问一号火星探测器磁强计的在轨标定
In-flight Calibration of the Magnetometer on the Mars Orbiter of Tianwen-1
摘要：
火星轨道器磁强计（MOMAG）是天问一号轨道器上的七个科学有效载荷之一。与大多数卫星不同的是，天问一号的轨道器没有进行磁力清洁，放置磁力计传感器的吊杆也不够长。这些都给磁场数据处理带来了许多挑战。本文介绍了天问一号/MOMAG的空中标定过程。该方法依次消除了航天器产生的动态磁场和缓慢变化的偏移量等磁干扰。然后将校准后的磁场数据与来自火星大气和挥发物演化（MAVEN）的数据进行比较。我们发现两个观测资料在太阳风中的一些物理结构是一致的，太阳风中的磁场强度分布也非常相似。这些结果表明，MOMAG的飞行校准是成功的，MOMAG为科学研究提供了可靠的数据。
英文摘要：
Mars Orbiter Magnetometer (MOMAG) is one of seven science payloads onboard Tianwen-1's orbiter. Unlike most of the satellites, Tianwen-1's orbiter is not magnetically cleaned, and the boom where placed the magnetometer's sensors is not long enough. These pose many challenges to the magnetic field data processing. In this paper, we introduce the in-flight calibration process of the Tianwen-1/MOMAG. The magnetic interference from the spacecraft, including spacecraft generated dynamic field and slowly-changing offsets are cleaned in sequence. Then the calibrated magnetic field data are compared with the data from the Mars Atmosphere and Volatile EvolutioN (MAVEN). We find that some physical structures in the solar wind are consistent between the two data sets, and the distributions of the magnetic field strength in the solar wind are very similar. These results suggest that the in-flight calibration of the MOMAG is successful and the MOMAG provides reliable data for scientific research.
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