Discovery and interpretation of Super-Alfvénic Oscillations in Solar Radio Burst sources

Abstract

Type III solar radio bursts are coherent EM waves generated at the local plasma frequency and its harmonic, via wave-particle interactions triggered by the passage of energetic electron beams originating from particle acceleration sites. These electron beams are constrained to travel along $\sim B$ and, in principle, can be used to study the detailed dynamics of the magnetic field bundles along which they travel. However, it had remained a challenge to extract this dynamical information from observations as it gets modified by radio wave propagation effects in the Corona. Making progress here requires spectroscopic snapshot (SS) imaging with good imaging fidelity at sub-second and sub-MHz resolutions, which is only becoming possible now with the availability of new generation of instruments like the Murchison Widefield Array.