Please join us for the COMPRES Keynote Lecture Series with: Dr. Joseph O'Rourke Arizona State University on October 22, 2020 at 4pm EDT Zoom link: https://unm.zoom.us/j/92342893928?pwd=ZTdKQW1zZ0M3U0lERE1BUnRETHNDZz09 Talk title and abstract: Chemistry Controls Dynamos in Metallic Cores: A Tour of the Solar System and Beyond Magnetic fields provide unique windows into the deep interiors of planetary bodies and their evolution over deep time. Most worlds in our Solar System with radii >1,500 km and metallic (iron-rich) cores are known to have a dynamo today or had one in the past. Simple models assume that dynamos typically arise from thermal convection, which leads to a simple criterion for dynamo activity: the total heat flow across the core/mantle boundary must exceed that which is conducted upwards along the adiabatic temperature gradient in the core. However, chemical processes in metallic cores, including crystallization of an inner core and reactions with the basal mantle, can overpower thermal convection. In this lecture, we will tour the galaxy to see how chemistry may help or hinder a dynamo. We will start on Earth and then travel to our Moon and the other terrestrial planets (Mercury, Venus, and Mars). Next, we voyage out to Jupiter to explore why one Galilean satellite (Ganymede) has an active dynamo but not the others (especially Io and Europa). Finally, we leave our Solar System to speculate about the significance of future detections of magnetic fields at super-Earth (or super-Venus?) exoplanets. Ultimately, the general importance of chemical processes to dynamos highlights the need to understand key material properties across a highly multi-dimensional space of pressure, temperature, and composition. Please visit http://compres.unm.edu/events/keynote-lecture-series for more information. A calendar invite is attached. COMPRES Central Office compres@unm.edumailto:compres@unm.edu