This paper presents a study of Pc4-5 geomagnetic pulsations illustrated by those which were observed after the sudden commencement of May 02 of 2010 at 09 : 08 UT at the Brazilian stations TTB, VSS and SMS. We carry out the spectral analysis of a bivariate data using the Morse wavelets and calculate polarization attributes (ellipticity ratio, tilt angle and phase difference) in the time-frequency domain. The main pulsation wave packets occurred, for the selected day, around noon and a small enhancement of the pulsation amplitude is observed in the TTB station. A change in the pulsation polarization has been found for the TTB station, which we have attributed to effects of the equatorial electrojet.
@article{arxiv.1404.4321,
title = {A Study of Pc4-5 Geomagnetic Pulsations in the Brazilian Sector},
author = {David Oliva and Marcela C. Meirelles and Andrés R. R. Papa},
journal= {arXiv preprint arXiv:1404.4321},
year = {2014}
}