Although several aspects of the dynamics in the Earth's core remain poorly understood, enormous progress has been made in the past few decades. These advances have come in parts from numerical modeling and laboratory experiments. Both of these approaches have allowed to investigate the complex interaction between flow, magnetic field and density heterogeneities in a controlled environment similar to that of the Earth's core. Whether an element of the dynamics in these simulations actually occurs in the Earth's core can be assessed to a certain degree by comparing predictions with observable quantities. Proceeding in reverse has also proven to be a fruitful approach: the observed geomagnetic field and its variation have been used to extract possible dynamical scenarios that can explain specific features. A
picture of the dynamics taking place in the Earth's core at various timescales is thus slowly emerging, albeit one that remains very incomplete. In this session, we welcome contributions exploring the dynamics from annual to geological timescales, in an attempt to bring together ideas from observations, experiments and numerical modeling on our understanding of Earth's core dynamics.