  We report on turbulent dynamo simulations in a spherical wedge with an outer
coronal layer. We apply a two-layer model where the lower layer represents the
convection zone and the upper layer the solar corona. This setup is used to
study the coronal influence on the dynamo action beneath the surface.
Increasing the radial coronal extent gradually to three times the solar radius
and changing the magnetic Reynolds number, we find that dynamo action benefits
from the additional coronal extent in terms of higher magnetic energy in the
saturated stage. The flux of magnetic helicity can play an important role in
this context.
