Radio Spectroscopic Imaging of a Solar Flare Termination Shock: Split-band Feature as Evidence for Shock Compression

Perhaps the most plausible case for one of the fundamental "predictions" of CSHKP: the existence of type-II-like radio bursts at a shock formed at the termination of the reconnection outflow. Previous reports of this phenonenon had been entirely unconvincing, but did produce an elegant cartoon.

      The radio signatures here are "decimetric spike bursts" rather than a spatially stationary and continuing type II burst, but that may be plausible; as the paper acknowledges, the best evidence for direct observation of reconnection outflows does not suggest that they could form shocks, but again that might be plausible. Finally, the Archivist notes that this kind of observation is extremely rare, whereas the cartoon implies that it should be ubiquitous. The moment chosen for analysis in this event coincides with the launch of type III bursts, nominally associated with open field lines rather than closed arcade loops. Thus there is quite a stack of plausibilities here, and so the jury is still out in spite of this excellent observational work.