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Study of the Influence of the Solar Wind Energy on the Geomagnetic Activity for Space Weather Science

Research paper by Daniele Telloni, Francesco Carbone, Ester Antonucci, Roberto Bruno, Catia Grimani, Umberto Villante, Silvio Giordano, Salvatore Mancuso, Luca Zangrilli

Indexed on: 27 Jun '20Published on: 22 Jun '20Published in: The Astrophysical journal



Abstract

This paper addresses the investigation of the interaction of the solar wind energy with the Earth’s magnetosphere, by studying its correlation with the disturbance storm time (Dst) index, a proxy of the geomagnetic activity. Some relevant parameters of the solar wind (the bulk speed and the z -component of the interplanetary magnetic field) are explored in the energy−Dst space. It results that (i) the solar wind energy and the geomagnetic activity are strictly related, with the coronal mass ejections representing the most energetic and geoeffective driver; (ii) the slow solar wind has negligible effects on Earth regardless of its energy content, whereas high-speed streams may induce severe geomagnetic storming depending on the advected energy; and (iii) while at low and mid energies, geomagnetic disturbances are induced provided the magnetic reconnection between the interplanetary and terrestrial magnetic fields occurs, high-energy solar wind plasma can impact Earth even w...