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In order to test the role of large-scale magnetic fields in quasiperiodicoscillation phenomena observed in microquasars, we study oscillatory motion ofcharged particles in vicinity of a Schwarzschild black hole immersed into anexternal asymptotically uniform magnetic field. We determine the fundamentalfrequencies of small harmonic oscillations of charged test particles aroundstable circular orbits in the equatorial plane of a magnetized black hole, anddiscuss the radial profiles of frequencies of the radial and latitudinalharmonic oscillations in dependence on the mass of the black hole and thestrength of the magnetic field. We demonstrate that assuming relevance ofresonant phenomena of the radial and latitudinal oscillations of chargedparticles at their frequency ratio $3:2$, the oscillatory frequencies ofcharged particles can be well related to the frequencies of the twinhigh-frequency quasi-periodic oscillations observed in the microquasars GRS1915+105, XTE 1550-564 and GRO 1655-40.

Quasi-harmonic oscillatory motion of charged particles around a Schwarzschild black hole immersed in an uniform magnetic field