Comment on 'Modeling Extreme 'Carrington-Type' Space Weather Events Using Three-Dimensional Global MHD Simulations' by C. M. Ngwira, A. Pulkkinen, M. M. Kuznetsova, and A. Glocer'

摘要

An alternative scenario to the Ngwira et al. (2014, https://doi.org/10.1002/2013JA019661) high sheath densities is proposed for modeling the Carrington magnetic storm. Typical slow solar wind densities (~5 cm~(-3)) and lower interplanetary magnetic cloud magnetic field intensities (~90 nT) can be used to explain the observed initial and main phase storm features. A second point is that the fast storm recovery may be explained by ring current losses due to electromagnetic ion cyclotron wave scattering.