The August 2018 Geomagnetic Storm Observed by the High-Energy Particle Detector on Board the CSES-01 Satellite
Francesco Palma, Alessandro Sotgiu, Alexandra Parmentier, M. Martucci, Mirko Piersanti, S. Bartocci, R. Battiston, W.J. Burger, D. Campana, Luca Carfora, G. Castellini, L. Conti, A. Contin, Giulia D’Angelo, C. De Donato, Cristian De De Santis, F. M. Follega, R. Iuppa, I. Lazzizzera, N. Marcelli, G. Masciantonio, М. Мерге, A. Oliva, G. Osteria, F. Palmonari, B. Panico, F. Perfetto, P. Picozza, M. Pozzato, E. Ricci, M. Ricci, S. Ricciarini, Z. Sahnoun, V. Scotti, R. Sparvoli, V. Vitale, Simona Zoffoli, P. Zuccon
Abstract
On 25 August 2018, a G3-class geomagnetic storm reached the Earth’s magnetosphere, causing a transient rearrangement of the charged particle environment around the planet, which was detected by the High-Energy Particle Detector (HEPD) on board the China Seismo-Electromagnetic Satellite (CSES-01). We found that the count rates of electrons in the MeV range were characterized by a depletion during the storm’s main phase and a clear enhancement during the recovery caused by large substorm activity, with the key role played by auroral processes mapped into the outer belt. A post-storm rate increase was localized at L-shells immediately above ∼3 and mostly driven by non-adiabatic local acceleration caused by possible resonant interaction with low-frequency magnetospheric waves.