The aeronomy and dynamics of solar system planet atmospheres have been modelled using Global Circulation Models (GCMs) for many decades. In recent years, GCMs have also been applied to exoplanet atmospheres - as many of them share many characteristics with solar system planet atmospheres (e.g., composition, ionization levels, rotation and stratification, etc.). Many Jupiter-size exoplanets are also found much nearer to their central star than Jupiter is to the Sun, posing an interesting challenge for coupling aeronomy and dynamics. We propose a joint session to discuss and compare the latest modelling results, including (but not limited to):

i) The various sources of available energy and how the energy depositions affect the neutral and ionised components of the upper atmospheres on gas giants, ice giants, and hot Jupiters.

ii) The coupling between the lower neutral atmosphere, ionosphere and magnetosphere.

iii) The atmospheric energy budget of these worlds.

The broad goal of this session is to spark dialogue and new collaborations between Earth, solar system and extrasolar system upper atmosphere communities.