  We consider classical billiards on surfaces of constant curvature, where the
charged billiard ball is exposed to a homogeneous, stationary magnetic field
perpendicular to the surface.
  We establish sufficient conditions for hyperbolicity of the billiard
dynamics, and give lower estimation for the Lyapunov exponent. This extends our
recent results for non-magnetic billiards on surfaces of constant curvature.
Using these conditions, we construct large classes of magnetic billiard tables
with positive Lyapunov exponents on the plane, on the sphere and on the
hyperbolic plane.
