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In-flight calibration of the spaceborne fluxgate magnetometer in the Martian magnetosheath

Earth and Planetary Physics 2022年第6期6卷 592-600页

作者： GuoQiang Wang Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen 518055China

In-flight calibration of the ze ro offset is crucial for ensuring high-precision measure ment of the spaceborne fluxgate magnetomete r.Tianwen-1 is China’s first Mars mission,and its orbiter will re main out of the solar wind for tens of days each year.Previous in-flight calibration methods might not be suitable for this orbiter during such a period.Recently,a new method was proposed by Wang GQ(2022 b),which we refer to as the Wang method Ⅱ for ease of description.Here,we test the performance of this method in the Martian magnetosheath by using magnetic field data measured by the Mars Atmosphere and Volatile EvolutioN(MAVEN) spacecraft.We find that the accuracy of the Wang method Ⅱ is affected by the number of magnetic field subinterval events,the eigenvalues of the minimum variance analysis for each event,and the position of the spacecraft in the magnetosheath.The estimated zero offset varies over a period of~27 days and has a 57.3% probability of accuracy within 2.0 nT.After being smoothed with a temporal window of 27 days,the ze ro offset has a 48.4%(99.3%) probability of accuracy within 1.0(2.0) nT.Our tests suggest that the Wang method Ⅱ provides an option for the Tianwen-1 orbiter to perform in-flight calibration when the orbiter remains out of the solar wind for an extended pe riod of time.

关键词： fluxgate magnetometer in-flight calibration zero offset Martian magnetosheath

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Automatic calculation of the magnetometer zero offset using the interplanetary magnetic field based on the Wang-Pan method

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Earth and Planetary Physics 2022年第1期6卷 52-60页

作者： XiaoWen Hu GuoQiang Wang ZongHao Pan Chinese Academy of Sciences Key Laboratory of Geospace Environment School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen 518055China

The space-borne fluxgate magnetometer(FGM)requires regular in-flight calibration to obtain its zero offset.Recently,Wang GQ and Pan ZH(2021a)developed a new method for the zero offset calibration based on the properties of Alfvén waves.They found that an optimal offset line(OOL)exists in the offset cube for a pure Alfvén wave and that the zero offset can be determined by the intersection of at least two nonparallel OOLs.Because no pure Alfvén waves exist in the interplanetary magnetic field,calculation of the zero offset relies on the selection of highly Alfvénic fluctuation events.Here,we propose an automatic procedure to find highly Alfvénic fluctuations in the solar wind and calculate the zero offset.This procedure includes three parts:(1)selecting potential Alfvénic fluctuation events,(2)obtaining the OOL,and(3)determining the zero offset.We tested our automatic procedure by applying it to the magnetic field data measured by the FGM onboard the Venus Express.The tests revealed that our automatic procedure was able to achieve results as good as those determined by the Davis-Smith method.One advantage of our procedure is that the selection criteria and the process for selecting the highly Alfvénic fluctuation events are simpler.Our automatic procedure could also be applied to find fluctuation events for the Davis-Smith method.

关键词： fluxgate magnetometer in-flight calibration zero offset highly Alfvénic fluctuations automatic procedure

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Magnetic field data processing methods of the China Seismo-Electromagnetic Satellite

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Earth and Planetary Physics 2018年第6期2卷 455-461页

作者： Bin Zhou YanYan Yang YiTeng Zhang XiaoChen Gou BingJun Cheng JinDong Wang Lei Li State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences Institute of Crustal Dynamics China Earthquake Administration

The High Precision magnetometer(HPM) on board the China Seismo-Electromagnetic Satellite(CSES) allows highly accurate measurement of the geomagnetic field; it includes FGM(fluxgate magnetometer) and CDSM(Coupled Dark State magnetometer)probes. This article introduces the main processing method, algorithm, and processing procedure of the HPM data. First, the FGM and CDSM probes are calibrated according to ground sensor data. Then the FGM linear parameters can be corrected in orbit, by applying the absolute vector magnetic field correction algorithm from CDSM data. At the same time, the magnetic interference of the satellite is eliminated according to ground-satellite magnetic test results. Finally, according to the characteristics of the magnetic field direction in the low latitude region, the transformation matrix between FGM probe and star sensor is calibrated in orbit to determine the correct direction of the magnetic field. Comparing the magnetic field data of CSES and SWARM satellites in five continuous geomagnetic quiet days, the difference in measurements of the vector magnetic field is about 10 nT, which is within the uncertainty interval of geomagnetic disturbance.

关键词： China Seismo-Electromagnetic Satellite(CSES) High Precision magnetometer(HPM) fluxgate magnetometer CPT magnetometer data processing

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