Bifurcations of Magnetic Geodesic Flows on Surfaces of Revolution

We study magnetic geodesic flows invariant under rotations on the 2-sphere. The dynamical system is given by a generic pair of functions $$(f,\Lambda)$$ in one variable. The topology of the Liouville fibration of the given integrable system near its singular orbits and singular fibers is described. The types of these singularities are computed. The topology of the Liouville fibration on regular 3-dimensional isoenergy manifolds is described by computing the Fomenko–Zieschang invariant. All possible bifurcation diagrams of the momentum mappings of such integrable systems are described. It is shown that the bifurcation diagram consists of two curves in the $$(h,k)$$ -plane. One of these curves is a line segment $$h=0$$ , and the other lies in the half-plane $$h\ge0$$ and can be obtained from the curve $$(a:-1:k) = (f:\Lambda:1)^*$$ projectively dual to the curve $$(f:\Lambda:1)$$ by the transformation $$(a:-1:k)\mapsto(a^2/2,k)=(h,k)$$ . DOI 10.1134/S1061920825600084