Suppression of Solar Radio Noise Storms in Eruptive Flares

摘要

We report four cases in which eruptive flares were accompanied by sharp decreasesin pre-existing radio noise storm intensity observed by the IZMIRAN station at 169 ard 204 MHz. The type IV/noise storm emission probably originated in similar eruptive flares occurring earlier in the same active region complexes. In several cases, the flares were accompanied by coronal mass ejections (CMEs) observed by the Solwind or SMM coronagraphs. We suggest that a noise storm accompanying streamer reformation following an initial CME was interrupted by the disruption of the streamer in the second CME.