Observations of the 24 September 1997 coronal flare waves

We report coincident observations of coronal and chromospheric 'flare wave' transients in association with a flare, large-scale coronal dimming, metri c radio activity and a coronal mass ejection. The two separate eruptions oc curring on 24 September 1997 originate in the same active region and displa y similar morphological features. The first wave transient was observed in EUV and H alpha data, corresponding to a wave disturbance in both the chrom osphere and the solar corona, ranging from 250 to approaching 1000 km s(-1) at different times and locations along the wavefront. The sharp wavefront had a similar extent and location in both the EUV and H alpha data. The dat a did not show clear evidence of a driver, however. Both events display a c oronal EUV dimming which is typically used as an indicator of a coronal mas s ejection in the inner corona. White-light coronagraph observations indica te that the first event was accompanied by an observable coronal mass eject ion while the second event did not have clear evidence of a CME. Both erupt ions were accompanied by metric type II radio bursts propagating at speeds in the range of 500-750 km s(-1), and neither had accompanying interplaneta ry type II activity. The timing and location of the flare waves appear to i ndicate an origin with the flaring region, but several signatures associate d with coronal mass ejections indicate that the development of the CME may occur in concert with the development of the flare wave.