Analysis of the historical geomagnetic field in South America

• Grant number: 13/16382-0
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: January 01, 2014
• End date: May 31, 2018
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geophysics
• Principal Investigator: Ricardo Ivan Ferreira da Trindade
• Grantee: Wilbor Poletti Silva
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated scholarship(s): 16/22960-4 - Geomagnetic field strength in the Amazon region from microwave archeointensity measurements, BE.EP.DD

Abstract

Secular changes in direction and intensity of the geomagnetic field can be used to infer about the mechanisms of field generation in the Earth's outer core. In this project we will analyze the variations, in time and space, of the Earth's magnetic field over South America, where the dipolar components of the geomagnetic field are anomalously weak. This region, one of the most important windows for understanding the magnetohydrodynamics in the in outer core and in the core-mantle boundary, is still poorly covered by data. We will investigate: (a) variations of intensity and inclination of the geomagnetic field in historical materials (e.g. bricks and tiles) of South America, especially in southern Brazil, northern Argentina and southern Bolivia (Jesuit Missions of the XVII-XVIII centuries); (b) the response of local and global geomagnetic field models to the new data for South America, including the experimental data to be obtained in the thesis. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

POLETTI, WILBOR; BIGGIN, ANDREW J.; TRINDADE, RICARDO I. F.; HARTMANN, GELVAM A.; TERRA-NOVA, FILIPE. Continuous millennial decrease of the Earth's magnetic axial dipole. PHYSICS OF THE EARTH AND PLANETARY INTERIORS, v. 274, p. 72-86, JAN 2018. (13/16382-0)

HARTMANN, GELVAM A.; POLETTI, WILBOR; TRINDADE, RICARDO I. F.; FERREIRA, LUCIO M.; SANCHES, PEDRO L. M.. New archeointensity data from South Brazil and the influence of the South Atlantic Anomaly in South America. Earth and Planetary Science Letters, v. 512, p. 124-133, APR 15 2019. (13/16382-0, 16/22960-4)

POLETTI, WILBOR; TRINDADE, RICARDO I. F.; HARTMANN, GELVAM A.; DAMIANI, NADIR; RECH, RAQUEL M.. Archeomagnetism of Jesuit Missions in South Brazil (1657-1706 AD) and assessment of the South American database. Earth and Planetary Science Letters, v. 445, p. 36-47, JUL 1 2016. (13/16382-0, 10/10754-4)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

SILVA, Wilbor Poletti. Archaeomagnetic field intensity evolution during the last two millennia. 2018. Doctoral Thesis - Universidade de São Paulo (USP). Instituto Astronômico e Geofísico (IAG/SBD) São Paulo.