QUIESCENT NONTHERMAL RADIO-EMISSION FROM STELLAR-SYSTEMS

Non-thermal radio emission has been detected from dMe stars, RS CVn bi naries and W T Tauri stars. Polarisation and intensity measurements of the quiescent (i.e. non-flaring) emission indicate that the emission is gyrosynchrotron emission from mildly relativistic electrons spirall ing in a. magnetic field. A three-dimensional dipole magnetic field mo del for the stellar field is presented and the quiescent gyrosynchrotr on emission from such a model is calculated and compared with observat ions. The model can account for many phenomenological features of quie scent emission. Quantitative comparisons of model results with observa tions indicate that the electron distribution in the emission region m ay be a magnetic mirroring distribution.