Preprints
https://doi.org/10.5194/gi-2023-10
https://doi.org/10.5194/gi-2023-10
01 Feb 2024
 | 01 Feb 2024
Status: this preprint is currently under review for the journal GI.

Macapá, a Brazilian equatorial magnetometer station: installation, data availability and methods for temperature correction

Cristiano Mendel Martins, Katia Jasbinschek Pinheiro, Achim Ohlert, Jürgen Matzka, Marcos Vinicius da Silva, and Reynerth Pereira da Costa

Abstract. In the last 60 years, the largest displacement of the magnetic equator (by about 1100 km northwards) occurred in the Brazilian longitudinal sector. The magnetic equator passed by Tatuoca magnetic observatory (TTB) in northern Brazil in 2012 and continues to move northward. Due to the horizontal geomagnetic field geometry at the magnetic equator, enhanced electric currents in the ionosphere are produced – the so called equatorial electrojet (EEJ). The magnetic effect of the EEJ is observed in the range of ± 3 degrees from the magnetic equator, where magnetic observatories record an amplified daily variation of the H component. In order to track the spatial and temporal variation of this phenomena, a new magnetometer station was installed in Macapá (MAA), which is about 350 km northwest from TTB. In this paper, we present the setup and data analysis of MAA station from 11/2019 until 09/2021. Because of its special configuration, we develop a method for temperature correction of the vector magnetometer data.

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Cristiano Mendel Martins, Katia Jasbinschek Pinheiro, Achim Ohlert, Jürgen Matzka, Marcos Vinicius da Silva, and Reynerth Pereira da Costa

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Review of the submission # gi-2023-10', Anatoly Soloviev, 15 Feb 2024
    • AC3: 'Reply on RC1', Marcos Vinicius Siqueira da Silva, 18 Apr 2024
  • RC2: 'Comment on gi-2023-10', Jan Reda, 26 Feb 2024
    • AC1: 'Reply on RC2', Marcos Vinicius Siqueira da Silva, 18 Apr 2024
  • RC3: 'Comment on gi-2023-10', Anna Willer, 10 Mar 2024
    • AC2: 'Reply on RC3', Marcos Vinicius Siqueira da Silva, 18 Apr 2024
  • RC4: 'Comment on gi-2023-10', Anonymous Referee #4, 11 Mar 2024
    • AC4: 'Reply on RC4', Marcos Vinicius Siqueira da Silva, 18 Apr 2024
Cristiano Mendel Martins, Katia Jasbinschek Pinheiro, Achim Ohlert, Jürgen Matzka, Marcos Vinicius da Silva, and Reynerth Pereira da Costa
Cristiano Mendel Martins, Katia Jasbinschek Pinheiro, Achim Ohlert, Jürgen Matzka, Marcos Vinicius da Silva, and Reynerth Pereira da Costa

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Short summary
The magnetic equator is the region where the magnetic field is horizontal and therefore strong ionospheric electric currents occur, the so-called Equatorial Electrojet. The magnetic equator is predicted to be at Macapa state in 2024. Therefore, a new magnetometer station was installed in Macapa in order to track the effects of the Equatorial Electrojet. We present the setup and data analysis of Macapa station and we develop a method for temperature correction of the vector magnetometer data.