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. Thegeomagnetic field in the Brazilian sector is influenced by the South AmericanMagnetic Anomaly (SAMA) that causes a decrease in the magnitude of the localgeomagnetic field when compared to other regions in the world. Thus, themagnetometer network and data set of space weather over Brazil led by Embraceare important tools for promoting the understanding of geomagnetic fieldsover Brazil. In this sense, in this work we used the H  component ofgeomagnetic fields obtained at different sites in South America in order tocompare results from the phase coherence obtained from wavelet transform(WT). Results from comparison between Cachoeira Paulista (CXP) andEusebio (EUS), and Cachoeira Paulista and Sao Luis (SLZ), indicatedthat there exist some phenomena that occur simultaneously in both locations,putting them in the same phase coherence. However, there are other phenomenaputting both locations in a strong phase difference as observed between CXPand Rio Grande, Argentina (RGA). This study was done for a specific moderategeomagnetic storm that occurred in March 2003. The results are explained interms of nonlinear interaction between physical phenomena acting in distinctgeographic locations and at different times and scales. Keywords. Geomagnetism and paleomagnetism (time variations – diurnal to secular)

Comparison of &lt;i&gt;H&lt;/i&gt; component geomagnetic field time series obtained at different sites over South America

Comparison of <i>H</i> component geomagnetic field time series obtained at different sites over South America