A Study of Field Line Resonance (FLR) Phenomenon Via in Situ Observations

Abstract

In this research field line resonance (FLR) phenomenon have been investigated to occur in earth’s magnetosphere, and that is for a further verification of this phenomenon via data analysis. FLR could be generated in a specific plasma medium, e.g. generated via a fast mode wave within the coupling system of solar wind- earth’s magnetosphere (SW-M). Hence, many previous studies have focused on studying the FLR in earth’s magnetosphere because of the importance of this phenomenon in mechanisms of energy and momentum transfer from solar wind into earth’s magnetosphere. Here, in situ magnetic data were collected form the Geostationary Operational Environmental Satellites (GOES). And then from these time series data the power spectrum density in the Pc3-4 frequencies range (7-100 ) were obtained, and dynamic magnetograms (DM) were plotted. That is, in order to check FLR features in the enhanced amplitudes of waves obtained from the DM. Two types of pulsations was obtained, i.e. toroidal and poloidal modes waves, and the FLR features were observed in both these waves. It was concluded that FLR phenomenon take place, to some extent, frequently in the plasma environment of the SW- M coupling system.