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Inter-instrument Calibration Using Magnetic Field Data from Flux Gate Magnetometer (Fgm) and Electron Drift Instrument (Edi) Onboard Cluster : Volume 3, Issue 2 (30/07/2013)

By Nakamura, R.

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Book Id: WPLBN0004009142
Format Type: PDF Article :
File Size: Pages 29
Reproduction Date: 2015

Title: Inter-instrument Calibration Using Magnetic Field Data from Flux Gate Magnetometer (Fgm) and Electron Drift Instrument (Edi) Onboard Cluster : Volume 3, Issue 2 (30/07/2013)  
Author: Nakamura, R.
Volume: Vol. 3, Issue 2
Language: English
Subject: Science, Geoscientific, Instrumentation
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Giner, L., Teubenbacher, R., Magnes, W., Plaschke, F., Fornaçon, K., Glassmeier, K.,...Torbert, R. B. (2013). Inter-instrument Calibration Using Magnetic Field Data from Flux Gate Magnetometer (Fgm) and Electron Drift Instrument (Edi) Onboard Cluster : Volume 3, Issue 2 (30/07/2013). Retrieved from

Description: Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria. We compare the magnetic field data obtained from the Flux-Gate Magnetometer (FGM) and the magnetic field data deduced from the gyration time of electrons measured by the Electron Drift Instrument (EDI) onboard Cluster to determine the spin axis offset of the FGM measurements. Data are used from orbits with their apogees in the magnetotail, when the magnetic field magnitude was between about 20 nT and 500 nT. Offset determination with the EDI-FGM comparison method is of particular interest for these orbits, because no data from solar wind are available in such orbits to apply the usual calibration methods using the Alfvén waves. In this paper, we examine the effects of the different measurement conditions, such as direction of the magnetic field relative to the spin plane and field magnitude in determining the FGM spin-axis offset, and also take into account the time-of-flight offset of the EDI measurements. It is shown that the method works best when the magnetic field magnitude is less than about 128 nT and when the magnetic field is aligned near the spin-axis direction. A remaining spin-axis offset of about 0.4 ~ 0.6 nT was observed between July and October 2003. Using multi-point multi-instrument measurements by Cluster we further demonstrate the importance of the accurate determination of the spin-axis offset when estimating the magnetic field gradient.

Inter-instrument calibration using magnetic field data from Flux Gate Magnetometer (FGM) and Electron Drift Instrument (EDI) onboard Cluster

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