Parametric Study of ICME Properties Related to Space Weather Disturbances via a Series of Three-Dimensional MHD Simulations

Interplanetary coronal mass ejections (ICMEs) are important drivers of space-weather disturbances observed at the Earth. We use a parameterized ICME model to investigate the relation between the physical properties of an ICME and these disturbances. Compared to those studies focused on deriving a best set of ICME parameter values matched with observed disturbances, this study is aimed at investigating the role of each parameter in producing space-weather disturbances. Toward this end, we performed a series of three-dimensional magnetohydrodynamic (MHD) simulations with different sets of ICME parameter values. These parameters are the location, speed, mass, magnetic field strength, and magnetic field orientation of a spheromak-shaped ICME, which is injected into the solar wind reconstructed from near-Sun data and interplanetary scintillation (IPS) data via an MHD-IPS tomography method. By comparing simulation results to in situ observations near the Earth we discuss how the physical properties of an ICME affect space-weather disturbances at the Earth.