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Post-flare arcades are well-known components of solar flare evolution, whichhave been observed for several decades. Coronal rain, cascades ofcatastrophically-cooled plasma, outline the loops and provide eye-catchingevidence of the recent flare. These events are acknowledged to be common, butthe scientific literature does not include any statistical overview documentingjust how common the phenomenon actually is. This study reviews Solar DynamicsObservatory Atmospheric Imaging Assembly (SDO AIA) observations of 241 flarescollected from the Space Weather Prediction Center (SWPC) database between 2011and 2018. The flares cover the entire strength range of the C, M, and X GOESclasses, and are distributed evenly across the SDO-observed majority of SolarCycle 24. We find that post-flare arcade rain occurs for nearly all X and mostM-class flares, but that it tapers off rapidly within C-class flares. Thereappears to be a cut-off point around C5, below which the occurrence ofpost-flare arcade rain drops significantly. There is also a general positivecorrelation between GOES class and the average duration of post-flare rainevents. Post-flare arcade rain events in C-class flares appear to track withthe sunspot number, providing a potential new tool for estimating, if notpredicting, solar cycle strength. Furthermore, condensations appear to besuppressed in the shortest-length arcade loops of any class observed,suggesting that active region heating is height-constrained. These results openup further avenues for future research, including new methods to estimateenergy deposition and to gain greater insight into steady active regionheating.

To Rain or Not to Rain: Correlating GOES Flare Class and Coronal Rain Statistics