Visite du prof. Jon Aurnou de University of California Los Angeles

John AurnouTurbulent Core Weather: Flux Patchy with a Chance of Reversals Jeudi 18 juin  à 11 hThe geomagnetic field is powered by turbulent flow in the Earth’s liquid metal outer core. In this seminar, he will first present the essential observations of the geomagnetic field. Then different scenarios will be presented on how best to explain the observations. Lastly, he will evaluate these scenarios based upon our present understanding of rapidly-rotating convective turbulence, and discuss how best to move forward in generating next-generation models of planetary core dynamics.   Laboratory Models of Planetary Jet FormationMardi 23 juin à 11 hStrong east-west directed, banded jets have long been observed in the atmospheres of the gas planets. However, it is still unknown how they are driven and to what depth they extend down into the planets. Are they driven by insolation or from internal heat of planetary formation? Are they relatively shallow atmospheric structures or do they extend down to Mbar depths? In this talk, he will present end-member models of planetary jet formation and then discuss a unique experiment being developed at IRPHE that seeks to generate, for the first time in the laboratory, strong zonal jet flows comparable to those found on the gas planets.  En savoir plus sur le laboratoire Spin-Lab Contact à IRPHE: Michael Le Bars (+33 (0)4 13 55 20 73 )