Coronal blast waves detected in soft X-rays

Several examples of rather clear X-ray detection of coronal blast waves have now been reported (e.g., Khan and Aurass, A&A 383, 1018, 2002). Interestingly, most of them have been reported from two particular active regions -- NOAA 8100 (November 1997) and 8210 (April-May 1998). The soft X-ray observations in some cases have high time resolution and the ability to look close to the core of the flare responsible for the wave. We summarize the observations to date, emphasizing the distinction between ejecta (magnetic loops) and freely running waves. Related observations now exist at metric and centimetric wavelengths, in the EUV, and in chromospheric lines (H-alpha and He 10830), and we describe the observational relationships among these different observations.