  We develop a new method to describe the accretion flow in the corona above a
thin disk around a black hole in vertical and radial extent. The model is based
on the same physics as the earlier one-zone model, but now modified including
inflow and outflow of mass, energy and angular momentum from and towards
neighboring zones. We determine the radially extended coronal flow for
different mass flow rates in the cool disk resulting in the truncation of the
thin disk at different distance from the black hole. Our computations show how
the accretion flow gradually changes to a pure vertically extended coronal or
advection-dominated accretion flow (ADAF). Different regimes of solutions are
discussed. For some cases wind loss causes an essential reduction of the mass
flow.

Astrophysics