01 Apr 2022
01 Apr 2022
Status: this preprint is open for discussion.

In-Situ Calibration of the Swarm-Echo Magnetometers

Robert M. Broadfoot1, David M. Miles1, Warren Holley2, and Andrew D. Howarth2 Robert M. Broadfoot et al.
  • 1Department of Physics and Astronomy, University of Iowa, Iowa City, 52242, United States
  • 2Department of Physics and Astronomy, University of Calgary, Calgary Alberta, T2N 1N4, Canada

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.

Robert M. Broadfoot et al.

Status: open (until 14 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-59', Mark Moldwin, 19 Apr 2022 reply
    • AC1: 'Reply on RC1', Robert Broadfoot, 20 Apr 2022 reply
  • RC2: 'Comment on egusphere-2022-59', Kenneth R. Bromund, 13 May 2022 reply

Robert M. Broadfoot et al.

Robert M. Broadfoot et al.


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Short summary
The Swarm-Echo Satellite carries two magnetometers that allows us to obtain two independent measurements of the changes that occur in the Earth’s magnetic field during events such as aurora. Magnetometers must be independently calibrated to ensure they remain accurate. If no magnetic reference is available, a model magnetic field must be used. This paper discusses the method used to calibrate the magnetometers on Swarm-Echo and show the improvements the calibration has made to the data product.