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Propagation mechanism analysis of different Magnetic Pulsation types under the influence of Equatorial Electrojet in the Brazilian sector

Authors

Piassi,  Amanda Resende
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Resende,  Laysa Cristina Araujo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Denardini,  Clezio Marcos
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Marchezi,  José Paulo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Alves,  Livia Ribeiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Piassi, A. R., Resende, L. C. A., Denardini, C. M., Marchezi, J. P., Alves, L. R. (2023): Propagation mechanism analysis of different Magnetic Pulsation types under the influence of Equatorial Electrojet in the Brazilian sector, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1026


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018227
Abstract
The magnetic pulsations measured on the ground-based magnetometer are used to study the magnetosphere and ionosphere dynamics, from their signatures of magnetohydrodynamic waves to their traveling along the geomagnetic field lines. It is also well-known that there are interactions with the particles in the environment where pulsations suffer structural modifications. In this context, we study the propagation mechanisms of the magnetic pulses generated in the polar regions to low latitudes. Additionally, we verified the correlation between the theoretical models of propagation of these waves (compressional, Alfvén, or even in the two coupled forms) and observational data. This analysis considers the Equatorial Electrojet Current (EEJ) influence on the amplitude of the pulsations from magnetometer data from the Carisma network and a temporary network of the National Observatory of Brazil. The results obtained show that the Pc3-type pulsations in the equatorial zones should be damped due to the high conductivity. This is attributed to the fact that the waves oscillating within Ultra-Low Frequency(ULF) which are initially compressional, resonate with the field lines of the magnetosphere and are converted into Alfvén waves.