Analysis of Pc3 And Pc4 Geomagnetic Pulsations over the Amazon Region

Abstract

The geomagnetic field produces aeronomic phenomena according to the Earth’s magnetic latitude. In South America, we find two important phenomena: the South America Magnetic Anomaly (SAMA) and the Equatorial Electrojet (EEJ). This study aimed to analyze the amplitudes of continuous magnetic pulsations (Pc3 and Pc4 type) in magnetic stations located between EEJ and SAMA. Based on the Dst index, we acquired data from four monitoring stations on quiet and disturbed days in August 2018. The magnetic pulsations in the equatorial region are related to the type of ionospheric conductivity, such as Cowling’s conductivity, contributing to amplifying the damping of Pcs wavelength. Finally, we found evidence that suggests a potential influence of the EEJ behavior on the amplitudes of Pc3 and Pc4. Therefore, the present study contributes to future research to fully understand the nature and extent of this influence.