Dynamo generated magnetic configurations in accretion discs and the
  nature of quasi-periodic oscillations in accreting binary systems
  Magnetic fields are important for accretion disc structure. Magnetic fields
in a disc system may be transported with the accreted matter. They can be
associated with either the central body and/or jet, and be fossil or dynamo
excited in situ. We consider dynamo excitation of magnetic fields in accretion
discs of accreting binary systems in an attempt to clarify possible
configurations of dynamo generated magnetic fields. We first model the entire
disc with realistic radial extent and thickness using an alpha-quenching
non-linearity. We then study the simultaneous effect of feedback from the
Lorentz force from the dynamo-generated field. We perform numerical simulations
in the framework of a relatively simple mean-field model which allows the
generation of global magnetic configurations. We explore a range of
possibilities for the dynamo number, and find quadrupolar-type solutions with
irregular temporal oscillations that might be compared to observed rapid
luminosity fluctuations. The dipolar symmetry models with $R_\alpha<0$ have
lobes of strong toroidal field adjacent to the rotation axis that could be
relevant to jet launching phenomena. We have explored and extended the
solutions known for thin accretion discs.
