%0 Journal Article %T Time Variations Analysis of the Geomagnetic Field in the Municipality of Maca¨¦, Brazil %A Laisa Prata Moreira Fernandes %A Joao Victor Jobim de Souza e Silva %A Iago Reis Homsi %A Paula de Carvalho Garcia %A Gabriel Teixeira de Oliveira Barroso %A Tain¨¢ Rebelo e Ribeiro %A Gabriel Gomes Dias de Oliveira %A Vania Regina de Oliveira Branco %A Hans Schmidt Santos %J Open Access Library Journal %V 7 %N 8 %P 1-14 %@ 2333-9721 %D 2020 %I Open Access Library %R 10.4236/oalib.1106646 %X This paper presents the analysis of temporal variations of the geomagnetic field in the municipality of Maca¨¦, Brazil. Current and historical magnetic field from the IGRF (International Geomagnetic Reference Field) and Gufm1 models were used to construct two-dimensional maps from 1590 to 2019. Analysis of the maps revealed that there was a large decrease in total magnetic field magnitude from around 48,000 nT in 1590 to 23,000 nT in 2019, i.e., a decrease of more than 50%. This decrease was interpreted as a direct influence of the east to west displacement of the South Atlantic Magnetic Anomaly (SAMA) in the last centuries. %K Geomagnetism %K IGRF %K Gufm1 %K South Atlantic Magnetic Anomaly %U http://www.oalib.com/paper/5437117