Speaker
Description
The Low-Frequency Array (LOFAR) has provided crucial insights into the dynamics of solar radio bursts, their sub-second fine structures, and the role of radio-wave propagation effects in shaping the observed emissions. The high temporal resolution of LOFAR’s beam-formed imaging mode (10 ms) enabled the tracking of burst motions on millisecond scales, revealing complex dynamics of radio-wave propagation through the corona. Our work has shown that the properties of decametre of solar radio burst fine structures are significantly influenced by radio-wave scattering on anisotropic density fluctuations of the turbulent corona, leading to broadened decay times, delayed peak intensities (by 1-2 s), superluminal source motion along the local field direction projected into the sky-plane, and rapid expansion across millisecond scales. The ability to resolve decametre observations of the shortest solar radio bursts has been crucial to developing a heliospheric turbulence model, refining our understanding of radio-wave propagation, and paving the way for propagation effects to be disentangled from observations to provide improved constraints of intrinsic source properties.
