Geomagnetic Field Variations During Periods Of Low And High Magnetic Activity At Ferraz Antarctic Station

The measurement of geomagnetic variations is very<br>important for understanding the behavior of the<br>earth’s magnetic field and its relation with sun’s<br>activity. The present study shows some results on the<br>daily variation and also on detection of geomagnetic<br>pulsations at Ferraz, (62°S, 58°W), in the Antarctic<br>region, during periods of low and high magnetic<br>activity. The station is situated near the border of the<br>South Atlantic Magnetic Anomaly region. The<br>geomagnetic field variations were measured using a<br>high sensitivity ring core three-axis (H,D,Z) fluxgate<br>magnetometer and a pair of magnetic coils. The data<br>analysis included the identification of the dominant<br>frequencies using Fast Fourier Transform (FFT). The<br>main results are discussed taking account the<br>interaction between the solar wind and the earth’s<br>magnetic cavity.