Geomagnetic field strength in the Amazon region from microwave archeointensity measurements

• Grant number: 16/22960-4
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• Start date: January 20, 2017
• End date: January 19, 2018
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geophysics
• Principal Investigator: Ricardo Ivan Ferreira da Trindade
• Grantee: Wilbor Poletti Silva
• Supervisor: Andrew John Biggin
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: University of Liverpool, England
• Associated to the scholarship: 13/16382-0 - Analysis of the historical geomagnetic field in South America, BP.DD

Abstract

Records of the Earth's magnetic field strength in archaeological and volcanic materials provides insights about processes that have occurred in the Earth's core for the last millennia. Several techniques have been developed to recover the archeointensity recorded in these materials. This has resulted in a large dataset whose geographic location is nowadays strongly concentrated in the northern hemisphere (~ 96% of the data). In order to contribute with new archeointensity data for the southern hemisphere, this internship project plans to obtain intensity results from Amazonian ceramics dating for the last three millennia. Considering the uniqueness of this material, we will perform the measurements with the microwave method (exclusive to the University of Liverpool), which needs less material, and also tends to minimize sample alteration bias regarding classical double-heating techniques. The direct implication from this proposal is a description of the magnetic field intensity evolution in a region that is still devoid of any record (North Brazil). The new data will also allow a better understanding of the generation mechanisms of the Earth's magnetic field. (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)

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)