第九届青年地学论坛

Many aspects of the Sun-Venus interaction during typical solar wind conditions have been investigated with measurements and simulation efforts. However, understanding the global effects on Venusian magnetic topology and ion escape during the large solar wind disturbance associated with the interplanetary coronal mass ejection (ICME) is still an open area of study. In this study, we investigate an extremely strong ICME interaction with Venus on 5 November 2011 by using a global multifluid MHD model. In order to evaluate the Venusian time-dependent response to the event, varying solar wind input conditions are used to drive the model. The simulation showed that the magnetic field line draping pattern on the dawnside during the ICME is similar to that during typical solar wind conditions, while on the duskside the magnetic field lines transition from quasi-perpendicular to quasi-parallel relative to the bow shock normal, resulting in reduced magnetic pressure and flux, and the magnetotail current sheet shifts towards the duskside. Depending on the magnetic topology, the planetary ion escape rates have doubled due to the ICME.
 

Venus,Model,Magnetic Topology