MICROWAVE RADIATION BURSTS AND THE SUPRATHERMAL ELECTRON VELOCITY DISTRIBUTION IN IMPULSIVE PHASE SOLAR FLARES
We discuss the observations of microwave bursts from impulsive phase solar flares in terms of a simple emission mechanism based on a triple resonance instability. This mechanism relies on the distinctive feature of the parallel electron velocity distribution which has been theoretically predicted to occur in the emitting region: a bump in the high energy tail. The characteristic velocity required for the bump and the polarization and frequency predicted for the radiation appear to be consistent with the observations and with existing theoretical work. The demands placed on this emission mechanism complement those given by results from Tokamak discharges during current decay. We suggest that this emission mechanism may represent a step towards understanding both sets of results, and supports the theoretical predictions of "bump in tail" suprathermal electron velocity distributions in both cases.
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON OX14 3DB (UK), MENTIONING REPORT CLM-P749, 1985
Record Number: 1989124037900 / Last updated on: 1987-01-01
Available languages: en