In order to observe and study the magnetic fields near Earth, high-quality magnetic field measurements are necessary. However, the spacecraft carrying magnetic field sensors are often magnetically noisy-they produce stray magnetic fields that contaminate the measurements. One dominant noise source on many spacecrafts are the systems that control the orientation of the spacecraft. This manuscript presents a novel approach to the suppression of magnetic interference caused by these systems, improving the quality of acquired data. Specifically, a technique for the simultaneous separation of multiple measurements into physically meaningful components is combined with an automated component selection technique. This allows for a high-quality estimate of the spacecraft noise to be generated and subsequently removed from magnetic field measurements, greatly improving the data quality. For example, an interval of data captured by the CASSIOPE/Swarm-Echo satellite was shown to have its local interference reduced by an average of 89%.

Abstract. CASSIOPE/e-POP, now known as Swarm-Echo, was launched in 2013 to study polar plasma outflow, neutral escape, and the effects of auroral currents on radio propagation in the ionosphere. The e-POP suite contains an array of eight instruments, including two fluxgate magnetometers on a shared boom. Until now, the two magnetometers relied on a set of preflight calibrations, which limited the accuracy of the magnetic field product and the magnetometers' utility for some applications. Here we present the results of an in situ calibration performed on data from 3 January 2014 to 30 January 2021 and a case study showing the improvements the calibration has made to the data utility. Periodic vector–vector calibration using the CHAOS magnetic field model results achieves an estimated root-mean-square (rms) uncertainty of 9 nT during nominal operation. This data product is now openly available through the ESA Swarm repository.

Abstract. CASSIOPE/e-POP, now known as Swarm-Echo, was launched in 2013 to study polar plasma outflow, neutral escape, and the effects of auroral currents on radio propagation in the ionosphere. The e-POP suite contains an array of eight instruments which include two fluxgate magnetometers on a shared boom. Until now, the two magnetometers relied on a set of prefight calibrations which limited the accuracy of the magnetic field product and their utility for some applications. Here we present the results of an in-situ calibration performed between on data from January 3, 2014, to January 30, 2021, and a case study showing the improvements the calibration has made to the data utility. Periodic vector-vector calibration using the Chaos magnetic field model results achieves an estimated RMS uncertainty of 9 nT during nominal operation. This data-product is now openly available through the ESA Swarm repository.

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