Siqueira F.,Observatorio Nacional MCT ON MCT |
Pinheiro K.J.,Observatorio Nacional MCT ON MCT
Revista Brasileira de Geofisica | Year: 2015
Magnetic observatories are fundamental to study different magnetic sources, measuring precisely and continuously the geomagnetic field. The largest restriction of the observatories is their uneven distribution on the Earth’s surface, especially in South America, where only few data are available. In this work, we describe the main steps for the installation of the magnetic observatory in Pantanal Region (Brazil) and the data analysis of a magnetic station that registered the field from September 29th, 2011 up to January 25th, 2012. From the geomagnetic point of view, the installation of the magnetic observatory is interesting due to the occurrence of the South Atlantic Magnetic Anomaly (SAMA), which is the region with the smallest intensity of the geomagnetic field. The SAMA is generated by dynamical processes in the external core, but many unsolved questions concerning its temporal evolution and its causes still remain. This anomaly causes effects in the external field: during magnetic storms there may be problems in satellites, navigation systems and radio-communication. These disturbances more often occur in areas where the intensity of the field is smaller (as in the case of SAMA) or larger (as at the poles). The data generated by the Pantanal observatory will contribute to a better understanding of SAMA and its effects in the external magnetic field. © 2015 Sociedade Brasileira de Geofísica.