A nugget has been post on EGU Solar-Terrestrial Sciences blog page about using J bursts to study electron beam velocities and the physical parameters of large coronal loops.
By J. Zhang et al

https://blogs.egu.eu/divisions/st/2023/03/16/employing-j-burst-observations-made-by-lofar-to-determine-the-properties-of-large-coronal-loops/