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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 36, issue 3
Ann. Geophys., 36, 937-943, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Space weather connections to near-Earth space and the...

Ann. Geophys., 36, 937-943, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 26 Jun 2018

Regular paper | 26 Jun 2018

Comparison of H component geomagnetic field time series obtained at different sites over South America

Maurício J. A. Bolzan1, Clezio M. Denardini2, and Alexandre Tardelli3 Maurício J. A. Bolzan et al.
  • 1Astronomy and Space Physics Laboratory – Universidade Federal de Jataí – UFJ, BR 364, km 195, no. 3800, CEP 75801-615, Jataí, Goiás state, Brazil
  • 2Estudo e Monitoramento Brasileiro do Clima Espacial (Embrace), Instituto Nacional de Pesquisas Espaciais – INPE, S. J. Campos, São Paulo state, Brazil
  • 3Physics and Astronomy Laboratory, Universidade do Vale do Paraíba – UNIVAP, S. J. Campos, São Paulo state, Brazil

Abstract. The geomagnetic field in the Brazilian sector is influenced by the South American Magnetic Anomaly (SAMA) that causes a decrease in the magnitude of the local geomagnetic field when compared to other regions in the world. Thus, the magnetometer network and data set of space weather over Brazil led by Embrace are important tools for promoting the understanding of geomagnetic fields over Brazil. In this sense, in this work we used the H component of geomagnetic fields obtained at different sites in South America in order to compare results from the phase coherence obtained from wavelet transform (WT). Results from comparison between Cachoeira Paulista (CXP) and Eusébio (EUS), and Cachoeira Paulista and São Luis (SLZ), indicated that there exist some phenomena that occur simultaneously in both locations, putting them in the same phase coherence. However, there are other phenomena putting both locations in a strong phase difference as observed between CXP and Rio Grande, Argentina (RGA). This study was done for a specific moderate geomagnetic storm that occurred in March 2003. The results are explained in terms of nonlinear interaction between physical phenomena acting in distinct geographic locations and at different times and scales.

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