The talk will discuss evidence for a high-energy physical analogy between the extensively studied coronae of stars and the putative, poorly understood coronae of accretion disks in active galactic
nuclei (AGNs). The current picture of magnetic energy powering the X-ray and radio emission of stellar coronae will be reviewed with an emphasis on recent results for large X-ray flares. Subsequently, empirical evidence will be presented suggesting that the X-ray and
radio emission from AGNs originates in a corona akin to stellar. It will be demonstrated how the AGN coronal plasma parameters can be estimated using basic Compton scattering and synchrotron self-
absorption theory. The physical similarities between stellar and AGN coronal sources will be pointed out along with some obvious differences. Finally, X-ray and radio observations will be proposed to further explore the AGN coronal hypothesis.
