Speaker
Description
Secular variations in the geomagnetic field gradually alter the magnetic configuration that controls the ionospheric current systems responsible for the diurnal variation. However, this coupling has not yet been systematically quantified in the South American Magnetic Anomaly (SAMA) region. Therefore, the objective of this study is to investigate the long-term effects on the diurnal variation of the geomagnetic field by analyzing the coupling between the main field and ionospheric current systems. The methodology consists of a comparative analysis of magnetic stations in the SAMA region, using data from the Estudo e Monitoramento Brasileiro do Clima Espacial Magnetometer Network (EMBRACE MagNet) and the International Real-time Magnetic Observatory Network (INTERMAGNET). Spectral analysis and correlation techniques are applied to quantify the connection between secular and diurnal geomagnetic variations in the SAMA region. The expected results include quantifying the effect of long-term variation on the amplitude and phase of diurnal variation, identifying the characteristic time scales of coupling, and predictive empirical models applicable to space weather studies. This research will contribute to a fundamental understanding of regional geomagnetic-ionospheric coupling and improving diurnal variation models, with potential applications in geomagnetic monitoring and space weather forecasting.