Phenomenology of coronal mass ejections

An attempt to describe the phenomenology of solar coronal mass ejections (C MEs) at all wavelength bands is undertaken. The development of several typi cal CMEs in 1996 and 1997 is considered in detail. Among the properties rev ealed, we especially emphasize (1) the presence of initial eruption promine nces that are relatively distant from each other, (2) the development of CM Es from two eruption sites, and (3) the connection of CMEs with structural evolution, i.e., large-scale solar-activity complexes. In addition to deter mining the basic properties of CMEs, we compare scenarios for CMEs and hare s and search for common features in the natures of these phenomena, which h ave very different temporal and spatial scales. A qualitative model for the above phenomena is put forward.