Numerical Study of Two Injection Methods for the 2007 November 15 Coronal Mass Ejection in the Inner Heliosphere.

In this paper, we use two injection methods, i.e., coronal mass ejection (CME) with and without radial compression, to investigate the propagation of the 2007 November 15 CME in the inner heliosphere with a three-dimensional, time-dependent, numerical magnetohydrodynamic model. In order to reproduce the large-scale interplanetary magnetic field associated with the CME, the spheromak model is used to provide the intrinsic magnetic field structure of the CME. The modeled results also suggest that the CME without radial compression propagates in interplanetary space with a lower velocity and arrives at 1 au later. We interpret these differences as a result of different Lorentz forces acting on the two injection methods, which lead to different CME expansions in the heliosphere. Additionally, the model of a CME without radial compression tends to overestimate the radial extension at 1 au due to an overestimation of the CME radial size in the simulation and the modeled magnetic fields at 1 au are lower compared to the model of a CME with radial compression. The above results are all useful in understanding the dynamic process occurring between the CME and the solar wind. [ABSTRACT FROM AUTHOR]