13 Jun 2023
 | 13 Jun 2023

Analysis of geomagnetic observatory data and detection of geomagnetic jerks with the MOSFiT software package

Marcos Vinicius da Silva, Katia Pinheiro, Achim Ohlert, and Jürgen Matzka

Abstract. MOSFiT (Magnetic Observatories and Stations Filtering Tool) is a python package to visualize and filter data from magnetic observatories and magnetometer stations. The purpose of MOSFiT is to automatically isolate and analyze the secular variation (SV) information measured by geomagnetic observatories data. External field contributions may be reduced by selecting data according to local time and geomagnetic indices and by subtracting the magnetospheric field predictions of the CHAOS-7 model. MOSFiT calculates the SV by annual differences of monthly means and geomagnetic jerk occurrence time and amplitude are automatically calculated by fitting two straight-line segments in a user-defined time interval of the SV time series. Here, we present the new python package, validate it against independent results from previous publications, and show its application. In particular, we quantify the RMS misfit between SV derived from processing schemes and the SV predicted by CHAOS-7. Analysing the INTERMAGNET quasi-definitive data with MOSFIT allows for a timely investigation of SV such as the detection of recent geomagnetic jerks. It can also be used for data selection for e.g., external field studies as well as for quality control of geomagnetic observatory data.

Marcos Vinicius da Silva et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2023-79', J. Miquel Torta, 14 Jun 2023
  • RC1: 'Comment on egusphere-2023-79', Seiki Asari, 16 Aug 2023
    • AC1: 'Reply on RC1', Marcos Vinicius Siqueira da Silva, 20 Sep 2023
  • RC2: 'Comment on egusphere-2023-79', Jan Reda, 17 Aug 2023
    • AC2: 'Reply on RC2', Marcos Vinicius Siqueira da Silva, 20 Sep 2023
  • RC3: 'Comment on egusphere-2023-79', Rudi Cop, 18 Aug 2023
    • AC3: 'Reply on RC3', Marcos Vinicius Siqueira da Silva, 20 Sep 2023

Marcos Vinicius da Silva et al.

Model code and software

Magnetic Observatories and Stations Filtering Tool (MOSFiT) Marcos Vinicius da Silva

Marcos Vinicius da Silva et al.


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Short summary
Geomagnetic observatories are dedicated to the long-term monitoring of the Earth's magnetic field. Their time-series contain information mainly about the Earth's core and the near-Earth space environment. Our Python code access a global database with the most recent observatory data and allows to separate the information on the Earth's core. At the same time, it allows for an efficient check of the data quality. We present the code, validate it and explain its usage.