Propagation of CIR originated interplanetary shocks across magnetospheric boundaries

Recently, several studies have been devoted to the interaction of interplanetary (IP) shocks with the Earth's magnetospheric boundaries - the bow shock and the magnetopause using available multi-spacecraft data. Magnetosheath measurements with good time resolution (INTERBALL-1, CLUSTER, THEMIS) have been used to describe magnetospheric boundaries modification and movement, IP shock deformation and change of its orientation and speed. Also, trains of discontinuities generated by the IP shock -- bow shock interaction were observed in the magnetosheath, characterized to some extent, and compared with theoretical predictions and computer models. CIR driven interplanetary shocks near the Earth's orbit usually have their normals inclined to the Sun-Earth flowline and thus an asymmetry is induced with respect to the dawn and dusk magnetosheath flanks. It comprises differences due to varied IP shock/bow shock orientation, IP shock propagation time in the magnetosheath, etc. In this contribution we compare multi-spacecraft IP shock observations from both flanks with current concepts of the IP shock - bow shock interaction and stress out a role of the magnetopause in this process.