Conjectured dynamical structure of hot Jupiters:
At pressures larger than 100-800 bar, the intrinsic heat flux must
be transported by convection. The convective core is at or near
synchronous rotation with the star and has small latitudinal
and longitudinal temperature variations. At lower pressures a
radiative envelope is present. The top part of the atmosphere
is penetrated by the stellar light on the day side. The spatial
variation in insolation should drive winds that
transport heat from the day side to the night side.
(From Guillot 2000; Showman & Guillot 2001)