St. Patrick’s Day 2015 Geomagnetic Storm: Sources of Perturbations

The St. Patrick's Day 2015 geomagnetic storm, the strongest one of the solar cycle 24, was analyzed in order to highlight the possible sources accountable for the perturbations observed in recorded data during the storm.SuperMAG database was used to obtain ground data recordings in an equally distributed grid at the northern hemisphere scale that then were analyzed by means of the empirical orthogonal function method (EOF).The connection between the time series of the EOF modes and various geomagnetic indices (Dst, AE) that describe current systems in the magnetosphere and ionosphere, sources of perturbations, was achieved using the wavelet coherence analysis (WTC).