Characterization of CME-driven shocks in the interplanetary medium using type II radio bursts

The STEREO mission together with the continuous operation of the Wind mission give us the unique possibility of study Coronal Mass Ejections (CMEs) at different locations in the interplanetary medium. Although multi-spacecraft analysis of CMEs had not been so common in the last years, their study have been crucial for our understanding of the macroscopic and microscopic structures within the CMEs. In this work, we present the preliminary results of a broad spatial and temporal correlative study between CME-driven shocks with type II radio bursts. Our study is based on the characterization of two CME-driven shocks events observed by STEREO and Wind in 2007. We describe the propagation direction of the CMEs from the low Corona to 1 AU using white-light coronograph images and the features of its detection in-situ. Also, we established the main properties of the macroscopic shock and its in-situ type II counterpart. The events studied show complex structures associated to "compounds streams" which are considered as two or more simple streams which interact in space (i.e. CMEs, SIRs, CIRs). These interactions are responsible for the diversity of the physical phenomenology observed in the data. In particular, we found complex radio emission profiles that can be associated to the interaction of the ICME itself with the stream interface and with slow and fast isolated streams.