Coronae are circular structures on Venus associated with volcanic and tectonic activity. Recent work by Joseph O’Rourke and Suzanne Smrekar used updated Magellan altimetry data and stereo-derived topography to update the global number of coronae to 99 and to study how they are bending Venus’ crust. With this updated information, the team estimated that the heat flow within these regions is greater than 95 mW m-2, nearly twice the global average in most thermal models. This result suggests that the coronae are either a major factor in the heat budget or that Venus is cooling faster than expected.
Link to article: http://onlinelibrary.wiley.com/doi/10.1002/2017JE005358/full