  Magnetic fields surrounding black holes are responsible for various
astrophysical phenomena related to accretion processes and relativistic jets.
Depending on the source, the configuration of the field lines may differ
significantly, affecting the trajectories of charged particles and the
corresponding observables. Usually, the magnetic fields around black holes are
modeled within a single source or current generating the field. However,
magnetic fields can have more than a single origin, being a combination of
different fields, such as, e.g., that of an accretion disk and external
large-scale or Galactic ones. In this paper, we propose a combined magnetic
field solution given by the superposition of the uniform and Blandford-Znajek
split-monopole magnetic fields in a strong gravity regime of the Schwarzschild
black hole. We show that when the combined magnetic field components are
aligned, the resulting field is of a paraboloidal jetlike shape. Such a
configuration is supported by relativistic jet observations and is often
utilized in general relativistic magnetohydrodynamical simulations. In the
opposite orientation of the two field components, we observe looplike field
structures magnetically connecting the black hole with an accretion disk and
the magnetic null points, which can be related to the regions of magnetic
reconnection. In the combined magnetic field configurations, we analyze the
dynamics of charged particles, study their stability conditions, and find the
locations of stable off-equatorial structures close to the symmetry axis. We
consider an ionization of Keplerian accretion disk as a particular scenario of
particle scattering. From the numerical experiments, we conclude that charged
particles in the jetlike combination show a strong tendency to escape from the
black hole. In contrast, the looplike combination supports accretion of charged
particles into the black hole.
