Radio Emission from Turbulent Flare Plasma
Abstract
A model of radio emission from a localized turbulent flare plasma based on the plasma emission mechanism is presented. This work is aimed mainly to the transformation of wave modes, while incoming Langmuir waves, generated by particle beams, are described phenomenologically by various wave packets. The wave transformation is described by means of the Zakharov equations, but, in contrast to previous studies, where interacting wave modes filled the whole space, here only a limited interaction area is supposed. Due to this approach the wave energy movement effects are included. Our modelling starts with a Langmuir wave packet moving toward the interaction region, where the hydrodynamic turbulence, driven by outer (e.g. plasma outflows from the magnetic field line reconnection site) rather than ponderomotive forces, is supposed. The time evolution of the high-frequency electric field is then governed by the first Zakharov equation. The electromagnetic mode time dependence is calculated not only in the interaction region, but also at some selected distant point, which represents the Earth radiotelescope position. The aim of this modelling is the computation of the model dynamic spectrum, which can be directly compared with observed data, especially with the narrowband dm-spikes.
- Publication:
-
Hvar Observatory Bulletin
- Pub Date:
- 2000
- Bibcode:
- 2000HvaOB..24...69B