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Persistence of the South Atlantic Anomaly in geomagnetic observations, field models and numerical dynamos

Grant number: 18/07410-3
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): August 01, 2018
Effective date (End): July 31, 2021
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geophysics
Principal researcher:Ricardo Ivan Ferreira da Trindade
Grantee:Filipe Terra Nova dos Santos
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The geomagnetic field is generated by convection motions of an electrically conducting fluid at Earth's outer core. The field is measured directly at Earth's surface by observatories and at space by dedicated satellites. For periods preceding direct magnetic measurements, analysis of archeological material provides vital information about the field. Though complete self-consistent 3D solutions to all relevant fields inside the core, i.e. velocity, magnetic field and temperature (or co-density) can be only obtained with numerical dynamo simulations. Here in this project we explore geomagnetic observation, field models and numerical dynamo simulations to study the persistence of the South Atlantic Anomaly, which is the region of weakest intensity field at Earth's surface presently located on inland Brazil. The anomaly persistent in Brazil can have several societal impacts. This region is less shielded by the Earth's magnetic field and thus bombarded by energetic particle that degrade electronics , optics, solar panels , and other critical systems by braking chemical bonds and disrupting crystalline structures. Our key questions are: the dynamical origin on the core of low field intensity registered in archeomagnetic field series, how old are the South Atlantic Anomaly, is it the South Atlantic Anomaly mantle controlled, how does the heterogeneous CMB heat flux prescribe preferential convection and weak surface field and how does the amplitude of tomographic heterogeneous CMB heat flux determine dynamo regimes (dipolar or reversing) and properties.

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Scientific publications (5)
(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)
TRINDADE, RICARDO I. F.; JAQUETO, PLINIO; TERRA-NOVA, FILIPE; BRANDT, DANIELE; HARTMANN, GELVAM A.; FEINBERG, JOSHUA M.; STRAUSS, BECKY E.; NOVELLO, VALDIR F.; CRUZ, FRANCISCO W.; KARMANN, IVO; et al. Speleothem record of geomagnetic South Atlantic Anomaly recurrence. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v. 115, n. 52, p. 13198-13203, . (16/24870-2, 16/15807-5, 17/50085-3, 18/07410-3, 16/00299-4)
TERRA-NOVA, FILIPE; AMIT, HAGAY; CHOBLET, GAEL. Preferred locations of weak surface field in numerical dynamos with heterogeneous core-mantle boundary heat flux: consequences for the South Atlantic Anomaly. Geophysical Journal International, v. 217, n. 2, p. 1179-1199, . (18/07410-3)
PINHEIRO, K. J.; AMIT, H.; TERRA-NOVA, F.. Geomagnetic jerk features produced using synthetic core flow models. PHYSICS OF THE EARTH AND PLANETARY INTERIORS, v. 291, p. 35-53, . (18/07410-3)
AMIT, HAGAY; TERRA-NOVA, FILIPE; LEZIN, MAXIME; TRINDADE, RICARDO I.. Non-monotonic growth and motion of the South Atlantic Anomaly. EARTH PLANETS AND SPACE, v. 73, n. 1, . (18/07410-3)
TERRA-NOVA, FILIPE; AMIT, HAGAY. Magnetic boundary layers in numerical dynamos with heterogeneous outer boundary heat flux. PHYSICS OF THE EARTH AND PLANETARY INTERIORS, v. 309, . (18/07410-3)

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