Physics at the equator: from the lab the to the stars.

16-18 oct. 2019
ENS de Lyon, site Monod 46 allée d'Italie 69007 Lyon, FRANCE - Lyon (Francia)

Equatorial regions of planetary atmospheres, oceans and stars experience a rich variety of dynamical regimes, with common underlying physical mechanisms. On Earth, stratospheric winds undergo regular reversals with a 28 month period, oceanic currents are organized into vertically alternating jets, and the emergence of equatorial modes of variability such as the Madden Julian Oscillation remain a mysterious aspect of our climate system. In many planetary atmospheres, such as Jupiter, Saturn, Venus or Titan, the winds are in a supperrotating state with a strong eastward jet above the equator. Owing to tremendous progresses in observational techniques and computational capabilities, similar phenomena are currently being discovered in stars and exoplanets, while phase diagrams of possible dynamical regimes for astrophysical and geophysical flows are being mapped by systematic exploration of parameter space using numerical simulations. Meanwhile, theoretical tools from topology, nonlinear dynamics and quasilinear approaches are bringing new insights into the physics of equatorial waves and how they interact with mean-flows, underlying the robustness and the universality of the observed phenomena across these different fields. Physical mechanisms in different regimes parameters have been proposed, but a common framework in astrophysical and geophysical flows is still lacking. The aim of this interdisciplinary workshop is to gather specialists from different communities interested in equatorial phenomena, from linear effects to fully turbulent flows, from laboratory experiments to atmospheric dynamics and astrophysics. We intend to fertilize new collaborations and foster exchange of ideas between these different fields.
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