A New Method to Calculate the Fluxgate Magnetometer Offset in the Interplanetary Magnetic Field: 1. Using Alfvén Waves

Wang, Guoqiang; Pan, Zihan

doi:10.1029/2020ja028893

Cited by 6 publications

(36 citation statements)

References 34 publications

(61 reference statements)

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“…Alfvén waves do not change the magnetic field strength (Keiling, 2008 Wang and Pan (2021) found that there exists an OOL with good linearity in the offset cube, and this line passes through the real zero offset.…”

Section: Wang-pan Methodsmentioning

confidence: 95%

“…Recently, a new method has been proposed by Wang and Pan (2021) to calculate the zero offset of the FGM based on properties of the Alfvén wave. For the convenience of description, we refer to this new method as the Wang-Pan method.…”

Section: Introductionmentioning

confidence: 99%

“…For the convenience of description, we refer to this new method as the Wang-Pan method. Wang and Pan (2021) found that the zero offset O is on a straight line determined by an Alfvén wave event in the offset cube, and the authors defined this line as the optimal offset line (OOL). They also found that the intersection of at least two non-parallel OOLs determined by different Alfvén waves can be used to determine the zero offset.…”

Section: Introductionmentioning

confidence: 99%

“…The Wang-Pan method can deal with the IMF fluctuation with a duration less than 1 minute, and it calculates the zero offset more intuitive. However, Wang and Pan (2021) did not provide a method or criterion to select the IMF fluctuation to perform the Wang-Pan method.…”

Section: Introductionmentioning

confidence: 99%

“…

The space-borne fluxgate magnetometer (FGM) needs regular in-flight calibration to obtain its zero offset. Recently, a new method based on the properties of Alfvén waves for the zero offset calibration was developed by Wang and Pan (2021). They found that there exists an optimal offset line (OOL) in the offset cube for a pure Alfvén wave, and the zero offset can be determined by the intersection of at least two non-parallel OOLs.Since no pure Alfvén waves exist in the interplanetary magnetic field, the calculation of the zero offset relies on the selection of the highly Alfvénic fluctuation event.

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confidence: 99%

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

Wang

Pan

et al. 2021

Preprint

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Abstract. The space-borne fluxgate magnetometer (FGM) needs regular in-flight calibration to obtain its zero offset. Recently, a new method based on the properties of Alfvén waves for the zero offset calibration was developed by Wang and Pan (2021). They found that there exists an optimal offset line (OOL) in the offset cube for a pure Alfvén wave, and the zero offset can be determined by the intersection of at least two non-parallel OOLs. Since no pure Alfvén waves exist in the interplanetary magnetic field, the calculation of the zero offset relies on the selection of the highly Alfvénic fluctuation event. 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) selection of highly Alfvénic fluctuation events, (2) evaluation of the OOL of the selected fluctuation events, and (3) determination of the zero offset. We test our automatic procedure by applying it to the magnetic field data measured by the FGM onboard Venus Express. The tests reveal that our automatic procedure is able to achieve as good results as the Davis-Smith method. One advantage of our procedure is that the selection criteria and process for the highly Alfvénic fluctuation event are simpler. Our automatic procedure might also be applied to find fluctuation events for the Davis-Smith method after proper modification.

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Section: Wang-pan Methodsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…

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confidence: 99%

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

Wang

Pan

et al. 2021

Preprint

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A New Method to Calculate the Fluxgate Magnetometer Offset in the Interplanetary Magnetic Field: 2. Using Mirror Mode Structures

Wang

Pan

2021

JGR Space Physics

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Accurate magnetic field measurement is of great significance to the development of space exploration. The fluxgate magnetometer (FGM) is a magnetic field measuring instrument commonly used on the spacecraft. The zero offset of the spaceborne FGM varies slowly with time, thus it needs to be regularly calibrated. Here, we develop a new method to determine the zero offset of the FGM using mirror mode structures. This method is based on an assumption that the magnetic depression of mirror mode structures is only in the maximum variance direction. We find that each mirror mode structure has an optimal offset line (OOL), which is determined by the minimum strength of the modified magnetic field in the plane perpendicular to the maximum variance direction in an offset cube. The OOL is approximately parallel to the maximum variance direction and passes through the zero offset in the offset cube. The common intersection of at least two non‐parallel OOLs can be regarded as the zero offset, which accuracy tends to be higher with more events. Our method can simultaneously use the mirror modes and Alfvén waves, and is able to be applied to many regions, such as solar wind, planetary magnetosheaths and magnetospheres.

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Calibration of the Zero Offset of the Fluxgate Magnetometer on Board the Tianwen‐1 Orbiter in the Martian Magnetosheath

Wang,

Xiao,

et al. 2024

JGR Space Physics

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High‐precision measurements of the magnetic field are critical to explore the near‐Mars environment. The Mars Orbiter MAGnetometer (MOMAG) is one of seven payloads on board the Tianwen‐1 orbiter. Its zero offset needs regular calibration, and the Wang‐Pan method I is applied to the MOMAG when the Tianwen‐1 orbiter is in the solar wind. The orbiter will remain out of the solar wind over tens of days each year, a method is necessary to ensure the accuracy of the zero offset during this period. Recently, a new method was proposed by Wang (2022b), https://doi.org/10.3847/1538-4357/ac822c, which is referred to as the Wang method II for ease of description. Here, we test the performance of this method using the MOMAG data measured in the Martian magnetosheath. We find that the zero offset Ow determined by the Wang method II varies around the zero offset Owp calculated by the Wang‐Pan method I using the potential Alfvénic fluctuations in the solar wind. After smoothing with a temporal window of 27 days, Ow is able to achieve an accuracy close to Owp. If the data segment has no gaps and its duration is < 27 days, the smoothed Ow might have an error >2 nT, but the error tends to be smaller if the segment's duration is longer. Our tests suggest that the Wang method II is suitable for the in‐flight calibration of the MOMAG when the Tianwen‐1 orbiter remains out of the solar wind.

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A New Method to Calculate the Fluxgate Magnetometer Offset in the Interplanetary Magnetic Field: 1. Using Alfvén Waves

Abstract: We propose a new method to calculate the fluxgate magnetometer offset in the interplanetary magnetic field • This method is based on the highly Alfvénic property of the interplanetary magnetic field • This method is able to get a zero offset with a high accuracy

Cited by 6 publications

References 34 publications

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

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

A New Method to Calculate the Fluxgate Magnetometer Offset in the Interplanetary Magnetic Field: 2. Using Mirror Mode Structures

Calibration of the Zero Offset of the Fluxgate Magnetometer on Board the Tianwen‐1 Orbiter in the Martian Magnetosheath

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