Microwave and EUV observations of an Eruptive Solar Flare Event Featuring Supra Arcade Downflows

Supra-arcade downflows (SAD) are composed of many dark, finger-shaped plasma downflows that reside in turbulent areas above the post-flare arcade. Observational evidence suggests that these downflows are intimately related to magnetic reconnection. However, their origin and potential contribution to flare energy release and particle acceleration remain unclear. Although in some events, SADs have been suggested to correlate in time with radio and hard X-ray signatures of particle acceleration, spectrally and temporally resolved imaging observations of these emissions in the vicinity of the SADs have been elusive. Here we report microwave imaging spectroscopy and multi-band EUV observations of an eruptive flare event that occurred on 2022 May 11, which features multiple periods of SADs occurrence from the flare peak to its decay phase. In particular, we aim to identify radio counterparts of SADs, especially those that present non-thermal signatures. To achieve the goal, we utilize spatially resolved microwave spectral analysis and the differential emission measure technique to compare the observed microwave spectra to those expected from the thermal plasma. Our initial analysis has shown strong evidence of the presence of non-thermal electron contribution at the location of the SADs. We will discuss the implications of our results in flare energy release and the associated electron acceleration.